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<?php |
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/** |
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* @package Fuel\Common |
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* @version 2.0 |
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* @author Fuel Development Team |
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* @license MIT License |
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* @copyright 2010 - 2015 Fuel Development Team |
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* @link http://fuelphp.com |
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*/ |
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namespace Fuel\Common; |
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/** |
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* String handling with encoding support |
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* |
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* PHP needs to be compiled with --enable-mbstring |
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* or a fallback without encoding support is used |
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*/ |
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class Str |
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{ |
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protected $encoding = 'UTF-8'; |
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/** |
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* Truncates a string to the given length. It will optionally preserve |
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* HTML tags if $is_html is set to true. |
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* |
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* @param string $string the string to truncate |
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* @param int $limit the number of characters to truncate too |
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* @param string $continuation the string to use to denote it was truncated |
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* @param bool $is_html whether the string has HTML |
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* @return string the truncated string |
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*/ |
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public function truncate($string, $limit, $continuation = '...', $is_html = false) |
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{ |
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$offset = 0; |
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$tags = array(); |
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if ($is_html) |
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{ |
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// Handle special characters. |
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preg_match_all('/&[a-z]+;/i', strip_tags($string), $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER); |
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foreach ($matches as $match) |
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{ |
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if ($match[0][1] >= $limit) |
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{ |
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break; |
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} |
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$limit += ($this->length($match[0][0]) - 1); |
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} |
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// Handle all the html tags. |
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preg_match_all('/<[^>]+>([^<]*)/', $string, $matches, PREG_OFFSET_CAPTURE | PREG_SET_ORDER); |
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foreach ($matches as $match) |
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{ |
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if($match[0][1] - $offset >= $limit) |
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{ |
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break; |
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} |
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$tag = $this->sub(strtok($match[0][0], " \t\n\r\0\x0B>"), 1); |
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if($tag[0] != '/') |
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{ |
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$tags[] = $tag; |
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} |
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elseif (end($tags) == $this->sub($tag, 1)) |
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{ |
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array_pop($tags); |
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} |
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$offset += $match[1][1] - $match[0][1]; |
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} |
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} |
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$new_string = $this->sub($string, 0, $limit = min($this->length($string), $limit + $offset)); |
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$new_string .= ($this->length($string) > $limit ? $continuation : ''); |
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$new_string .= (count($tags = array_reverse($tags)) ? '</'.implode('></',$tags).'>' : ''); |
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return $new_string; |
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} |
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/** |
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* Add's _1 to a string or increment the ending number to allow _2, _3, etc |
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* |
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* @param string $str required |
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* @return string |
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*/ |
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public function increment($str, $first = 1, $separator = '_') |
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{ |
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preg_match('/(.+)'.$separator.'([0-9]+)$/', $str, $match); |
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return isset($match[2]) ? $match[1].$separator.($match[2] + 1) : $str.$separator.$first; |
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} |
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/** |
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* Checks wether a string has a precific beginning. |
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* |
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* @param string $str string to check |
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* @param string $start beginning to check for |
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* @param boolean $ignore_case wether to ignore the case |
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* @return boolean wether a string starts with a specified beginning |
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*/ |
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public function startsWith($str, $start, $ignore_case = false) |
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{ |
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return (bool) preg_match('/^'.preg_quote($start, '/').'/m'.($ignore_case ? 'i' : ''), $str); |
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} |
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/** |
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* Checks wether a string has a precific ending. |
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* |
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* @param string $str string to check |
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* @param string $end ending to check for |
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* @param boolean $ignore_case wether to ignore the case |
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* @return boolean wether a string ends with a specified ending |
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*/ |
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public function endsWith($str, $end, $ignore_case = false) |
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{ |
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return (bool) preg_match('/'.preg_quote($end, '/').'$/m'.($ignore_case ? 'i' : ''), $str); |
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} |
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/** |
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* substr |
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* |
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* @param string $str required |
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* @param int $start required |
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* @param int|null $length |
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* @param string $encoding default UTF-8 |
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* @return string |
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*/ |
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public function sub($str, $start, $length = null, $encoding = null) |
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{ |
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$encoding or $encoding = $this->encoding; |
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// substr functions don't parse null correctly |
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$length = is_null($length) ? (function_exists('mb_substr') ? mb_strlen($str, $encoding) : strlen($str)) - $start : $length; |
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return function_exists('mb_substr') |
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? mb_substr($str, $start, $length, $encoding) |
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: substr($str, $start, $length); |
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} |
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/** |
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* strlen |
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* |
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* @param string $str required |
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* @param string $encoding default UTF-8 |
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* @return int |
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*/ |
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public function length($str, $encoding = null) |
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{ |
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$encoding or $encoding = $this->encoding; |
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return function_exists('mb_strlen') |
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? mb_strlen($str, $encoding) |
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: strlen($str); |
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} |
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/** |
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* lower |
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* |
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* @param string $str required |
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* @param string $encoding default UTF-8 |
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* @return string |
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*/ |
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public function lower($str, $encoding = null) |
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{ |
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$encoding or $encoding = $this->encoding; |
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return function_exists('mb_strtolower') |
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? mb_strtolower($str, $encoding) |
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: strtolower($str); |
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} |
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/** |
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* upper |
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* |
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* @param string $str required |
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* @param string $encoding default UTF-8 |
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* @return string |
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*/ |
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public function upper($str, $encoding = null) |
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{ |
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$encoding or $encoding = $this->encoding; |
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return function_exists('mb_strtoupper') |
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? mb_strtoupper($str, $encoding) |
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: strtoupper($str); |
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} |
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/** |
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* lcfirst |
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* |
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* Does not strtoupper first |
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* |
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* @param string $str required |
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* @param string $encoding default UTF-8 |
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* @return string |
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*/ |
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View Code Duplication |
public function lcfirst($str, $encoding = null) |
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{ |
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$encoding or $encoding = $this->encoding; |
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return function_exists('mb_strtolower') |
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? mb_strtolower(mb_substr($str, 0, 1, $encoding), $encoding). |
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mb_substr($str, 1, mb_strlen($str, $encoding), $encoding) |
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: lcfirst($str); |
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} |
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/** |
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* ucfirst |
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* |
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* Does not strtolower first |
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* |
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* @param string $str required |
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* @param string $encoding default UTF-8 |
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* @return string |
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*/ |
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View Code Duplication |
public function ucfirst($str, $encoding = null) |
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{ |
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$encoding or $encoding = $this->encoding; |
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return function_exists('mb_strtoupper') |
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? mb_strtoupper(mb_substr($str, 0, 1, $encoding), $encoding). |
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mb_substr($str, 1, mb_strlen($str, $encoding), $encoding) |
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: ucfirst($str); |
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} |
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/** |
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* ucwords |
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* |
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* First strtolower then ucwords |
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* |
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* ucwords normally doesn't strtolower first |
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* but MB_CASE_TITLE does, so ucwords now too |
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* |
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* @param string $str required |
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* @param string $encoding default UTF-8 |
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* @return string |
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*/ |
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public function ucwords($str, $encoding = null) |
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{ |
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$encoding or $encoding = $this->encoding; |
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return function_exists('mb_convert_case') |
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? mb_convert_case($str, MB_CASE_TITLE, $encoding) |
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: ucwords(strtolower($str)); |
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} |
242
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243
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/** |
244
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* Creates a random string of characters |
245
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* |
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* @param string the type of string |
247
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* @param int the number of characters |
248
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* @return string the random string |
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*/ |
250
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public function random($type = 'alnum', $length = 16) |
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{ |
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switch($type) |
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{ |
254
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case 'basic': |
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$result = mt_rand(); |
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break; |
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case 'unique': |
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$result = md5(uniqid(mt_rand())); |
260
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break; |
261
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262
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case 'sha1' : |
263
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$result = sha1(uniqid(mt_rand(), true)); |
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break; |
265
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266
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default: |
267
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case 'alnum': |
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268
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case 'numeric': |
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case 'nozero': |
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case 'alpha': |
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case 'distinct': |
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case 'hexdec': |
273
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switch ($type) |
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{ |
275
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case 'alpha': |
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$pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
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break; |
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279
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case 'numeric': |
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$pool = '0123456789'; |
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break; |
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283
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case 'nozero': |
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$pool = '123456789'; |
285
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break; |
286
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287
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case 'distinct': |
288
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$pool = '2345679ACDEFHJKLMNPRSTUVWXYZ'; |
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break; |
290
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291
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case 'hexdec': |
292
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$pool = '0123456789abcdef'; |
293
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break; |
294
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295
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default: |
296
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case 'alnum': |
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297
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$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'; |
298
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} |
299
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300
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$result = ''; |
301
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for ($i=0; $i < $length; $i++) |
302
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{ |
303
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$result .= substr($pool, mt_rand(0, strlen($pool) -1), 1); |
304
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} |
305
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} |
306
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|
307
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return $result; |
308
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} |
309
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|
310
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/** |
311
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* Returns a closure that will alternate between the args which to return. |
312
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* If you call the closure with false as the arg it will return the value without |
313
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* alternating the next time. |
314
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* |
315
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* @return \Closure |
316
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*/ |
317
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public function alternator() |
318
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{ |
319
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// the args are the values to alternate |
320
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$args = func_get_args(); |
321
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|
322
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return function ($next = true) use ($args) |
323
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{ |
324
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static $i = 0; |
325
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return $args[($next ? $i++ : $i) % count($args)]; |
326
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}; |
327
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} |
328
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|
329
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/** |
330
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* Parse the params from a string using strtr() |
331
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* |
332
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* @param string string to parse |
333
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* @param array params to str_replace |
334
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* @return string |
335
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*/ |
336
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public function tr($string, $array = array()) |
337
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{ |
338
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if (is_string($string)) |
339
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|
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{ |
340
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$tr_arr = array(); |
341
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|
342
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foreach ($array as $from => $to) |
343
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{ |
344
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substr($from, 0, 1) !== ':' and $from = ':'.$from; |
345
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$tr_arr[$from] = $to; |
346
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} |
347
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unset($array); |
348
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|
349
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return strtr($string, $tr_arr); |
350
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} |
351
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else |
352
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{ |
353
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return $string; |
354
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} |
355
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} |
356
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|
|
|
357
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|
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/** |
358
|
|
|
* Check if a string is json encoded |
359
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|
|
* |
360
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* @param string $string string to check |
361
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* @return bool |
362
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*/ |
363
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public function is_json($string) |
364
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|
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{ |
365
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json_decode($string); |
366
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return json_last_error() === JSON_ERROR_NONE; |
367
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} |
368
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|
369
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/** |
370
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|
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* Check if a string is a valid XML |
371
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|
* |
372
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* @param string $string string to check |
373
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* @return bool |
374
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*/ |
375
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public function is_xml($string) |
376
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|
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{ |
377
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|
|
$internal_errors = libxml_use_internal_errors(); |
378
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|
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libxml_use_internal_errors(true); |
379
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|
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$result = simplexml_load_string($string) !== false; |
380
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|
|
libxml_use_internal_errors($internal_errors); |
381
|
|
|
|
382
|
|
|
return $result; |
383
|
|
|
} |
384
|
|
|
|
385
|
|
|
/** |
386
|
|
|
* Check if a string is serialized |
387
|
|
|
* |
388
|
|
|
* @param string $string string to check |
389
|
|
|
* @return bool |
390
|
|
|
*/ |
391
|
|
|
public function is_serialized($string) |
392
|
|
|
{ |
393
|
|
|
$array = @unserialize($string); |
394
|
|
|
return ! ($array === false and $string !== 'b:0;'); |
395
|
|
|
} |
396
|
|
|
|
397
|
|
|
/** |
398
|
|
|
* Check if a string is html |
399
|
|
|
* |
400
|
|
|
* @param string $string string to check |
401
|
|
|
* @return bool |
402
|
|
|
*/ |
403
|
|
|
public function is_html($string) |
404
|
|
|
{ |
405
|
|
|
return strlen(strip_tags($string)) < strlen($string); |
406
|
|
|
} |
407
|
|
|
} |
408
|
|
|
|
There are different options of fixing this problem.
If you want to be on the safe side, you can add an additional type-check:
If you are sure that the expression is traversable, you might want to add a doc comment cast to improve IDE auto-completion and static analysis:
Mark the issue as a false-positive: Just hover the remove button, in the top-right corner of this issue for more options.