RandomStr::genRandomBytes() - Code Metrics - ierusalim/php-random-gen - Measure and Improve Code Quality continuously with Scrutinizer

RandomStr::genRandomBytes() A
last analyzed 2019-05-27 05:09 UTC

↳ Parent: RandomStr

Complexity

Conditions	2
Paths	2

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
eloc	2
nc	2
nop	1
dl	0
loc	4
rs	10
c	0
b	0
f	0

<?php

namespace ierusalim\Random;

/**
 * This class RandomStr is intended for generating random strings of any chars
 * Can generate following types:
 *  - random bytes  (as random_bytes PHP7-function)
 *  - ASCII chars from specified lists
 *  - any UTF-8 chars from specified lists (multibyte supported)
 *
 * PHP Version 5.6
 *
 *
 * @package   ierusalim\RandomGen
 * @author    Alexander Jer <[email protected]>
 * @copyright 2017, Ierusalim
 * @license   https://opensource.org/licenses/Apache-2.0 Apache-2.0
 *
 *
 * Example of use:
 *
 *  $r = new RandomStr(); //initialized with default characters list (66 chars)
 *  echo $r->genRandomStr(99); //generate random 99 characters from default list
 *
 *  //It works fast. No problem for create random string of 1 million chars
 *  $str = $r->genRandomStr(1000000);
 *  echo "\nGenerated bytes: " . strlen($str);
 *
 *  //Need multibyte characters? No problems, set flag $utf8mode = true
 *  $r->setChars("神會貓性少女 迪克和陰部", true);
 *  echo $r->genRandomStr(888);
 *
 */
class RandomStr
{
    /**
     * @var array
     */
    public $char_sets;
    /**
     * Function for generation random bytes
     *
     * @var callable
     */
    public $rnd_fn;

    /**
     * When creating an object, can specify a list of characters for generation.
     * Two formats are possible:
     *  - one string of chars;
     *  - strings array for many chars_set.
     *
     * When specified one string, it is means a list of character set nmb=0
     * When specified array, it is considered many character sets by array keys.
     *
     * Its need for genRandomStr($len, $char_set_num=0) function.
     *
     * For using multibyte UTF-8 characters set $utf8mode parameter to true
     *
     * @param string|array $init_charset
     * @param boolean      $utf8
     */
    public function __construct($init_charset = null, $utf8mode = false)
    {
        // set default function for generation random bytes
        $this->rnd_fn = [$this, 'md5RandomBytes'];

        //check available function for quick-generation random bytes
        foreach ([
            '\random_bytes', //for PHP7
            '\openssl_random_pseudo_bytes', // better for PHP5, need OpenSSL ext
            '\mcrypt_create_iv', // need MCRypt
        ] as $fn) {
            if (\function_exists($fn)) {
                $this->rnd_fn = $fn;
                break;
            }
        }
        $this->setChars($init_charset, $utf8mode);
    }

    /**
     * See description this parameters in description for __construct
     *
     * @param string|array $init_charset
     * @param boolean      $utf8
     */
    public function setChars($init_charset = null, $utf8mode = false)
    {
        if (\is_array($init_charset)) {
            $this->char_sets = $init_charset;
        } elseif (is_string($init_charset)) {
            $this->char_sets = [$init_charset];
        } else {
            //by default used this characters
            $this->char_sets = [
                'abcdefghijklmnopqrstuvwxyz' .
                'ABCDEFGHIJKLMNOPQRSTUVWXYZ' .
                '01234567890_-.'
                ];
        }

        if ($utf8mode) {
            $this->explodeUtf8();
        }
    }

    protected function explodeUtf8()
    {
        foreach ($this->char_sets as $k => $chars) {
            if (\is_array($chars)) {
                continue;
            }
            $len = \mb_strlen($chars, "UTF-8");
            if ($len == \strlen($chars)) {
                continue;
            }
            $arr=[];
            for ($i = 0; $i < $len; $i++) {
                $arr[] = \mb_substr($chars, $i, 1, "UTF-8");
            }
            $this->char_sets[$k]=$arr;
        }
    }

    /**
     * Random string generate (specified length and optional characters-set nmb)
     *
     * Available characters placed in the strings array $this->char_sets
     * This array initializing when creating new RandomStr object.
     * This array is available as a public parameter and can modified like
     *  $r->char_sets[nmb] = 'string of avaliable characters for nmb'
     *
     * @param integer $len Length of generate string
     * @param integer $char_set_num Number of char_set selected for use
     *
     * @api
     * @staticvar string $chars
     *
     * @return string
     */
    public function genRandomStr($len = 10, $char_set_num = 0)
    {
        if (!isset($this->char_sets[$char_set_num]) || $len < 1) {
            return false;

        } elseif (is_array($this->char_sets[$char_set_num])) {
            $l = count($this->char_sets[$char_set_num]);
        } else {
            $l = \strlen($this->char_sets[$char_set_num]);
        }
        $outstr = '';
        if ($l) {
            foreach (\unpack('v*', call_user_func($this->rnd_fn, $len * 2)) as $n) {
                $outstr .= $this->char_sets[$char_set_num][$n % $l];
            }
        }
        return $outstr;
    }

    /**
     * Analog of PHP7-function random_bytes($length) for using under PHP5
     *
     * @param integer $length
     * @return string
     */
    public function genRandomBytes($length)
    {
        if ($length > 0) {
            return \call_user_func($this->rnd_fn, $length);
        }
    }

    /**
     * This function is used to generate bytes if the best functions not found
     *
     * @param integer $len
     * @return string
     */
    public function md5RandomBytes($len)
    {
        if ($len>0) {
            $start = mt_rand(9, PHP_INT_MAX);
            $output = '';
            while ($len > 16) {
                $output .= md5($start++, true);
                $len-=16;
            }
            $output .= substr( md5($start, true), 0, $len);
            return $output;
        }
    }
}


1			<?php
2
3			namespace ierusalim\Random;
4
5			/**
6			* This class RandomStr is intended for generating random strings of any chars
7			* Can generate following types:
8			* - random bytes (as random_bytes PHP7-function)
9			* - ASCII chars from specified lists
10			* - any UTF-8 chars from specified lists (multibyte supported)
11			*
12			* PHP Version 5.6
13			*
14			*
15			* @package ierusalim\RandomGen
16			* @author Alexander Jer <[email protected]>
17			* @copyright 2017, Ierusalim
18			* @license https://opensource.org/licenses/Apache-2.0 Apache-2.0
19			*
20			*
21			* Example of use:
22			*
23			* $r = new RandomStr(); //initialized with default characters list (66 chars)
24			* echo $r->genRandomStr(99); //generate random 99 characters from default list
25			*
26			* //It works fast. No problem for create random string of 1 million chars
27			* $str = $r->genRandomStr(1000000);
28			* echo "\nGenerated bytes: " . strlen($str);
29			*
30			* //Need multibyte characters? No problems, set flag $utf8mode = true
31			* $r->setChars("神會貓性少女迪克和陰部", true);
32			* echo $r->genRandomStr(888);
33			*
34			*/
35			class RandomStr
36			{
37			/**
38			* @var array
39			*/
40			public $char_sets;
41			/**
42			* Function for generation random bytes
43			*
44			* @var callable
45			*/
46			public $rnd_fn;
47
48			/**
49			* When creating an object, can specify a list of characters for generation.
50			* Two formats are possible:
51			* - one string of chars;
52			* - strings array for many chars_set.
53			*
54			* When specified one string, it is means a list of character set nmb=0
55			* When specified array, it is considered many character sets by array keys.
56			*
57			* Its need for genRandomStr($len, $char_set_num=0) function.
58			*
59			* For using multibyte UTF-8 characters set $utf8mode parameter to true
60			*
61			* @param string\|array $init_charset
62			* @param boolean $utf8
63			*/
64			public function __construct($init_charset = null, $utf8mode = false)
65			{
66			// set default function for generation random bytes
67			$this->rnd_fn = [$this, 'md5RandomBytes'];
68
69			//check available function for quick-generation random bytes
70			foreach ([
71			'\random_bytes', //for PHP7
72			'\openssl_random_pseudo_bytes', // better for PHP5, need OpenSSL ext
73			'\mcrypt_create_iv', // need MCRypt
74			] as $fn) {
75			if (\function_exists($fn)) {
76			$this->rnd_fn = $fn;
77			break;
78			}
79			}
80			$this->setChars($init_charset, $utf8mode);
81			}
82
83			/**
84			* See description this parameters in description for __construct
85			*
86			* @param string\|array $init_charset
87			* @param boolean $utf8
88			*/
89			public function setChars($init_charset = null, $utf8mode = false)
90			{
91			if (\is_array($init_charset)) {
92			$this->char_sets = $init_charset;
93			} elseif (is_string($init_charset)) {
94			$this->char_sets = [$init_charset];
95			} else {
96			//by default used this characters
97			$this->char_sets = [
98			'abcdefghijklmnopqrstuvwxyz' .
99			'ABCDEFGHIJKLMNOPQRSTUVWXYZ' .
100			'01234567890_-.'
101			];
102			}
103
104			if ($utf8mode) {
105			$this->explodeUtf8();
106			}
107			}
108
109			protected function explodeUtf8()
110			{
111			foreach ($this->char_sets as $k => $chars) {
112			if (\is_array($chars)) {
113			continue;
114			}
115			$len = \mb_strlen($chars, "UTF-8");
116			if ($len == \strlen($chars)) {
117			continue;
118			}
119			$arr=[];
120			for ($i = 0; $i < $len; $i++) {
121			$arr[] = \mb_substr($chars, $i, 1, "UTF-8");
122			}
123			$this->char_sets[$k]=$arr;
124			}
125			}
126
127			/**
128			* Random string generate (specified length and optional characters-set nmb)
129			*
130			* Available characters placed in the strings array $this->char_sets
131			* This array initializing when creating new RandomStr object.
132			* This array is available as a public parameter and can modified like
133			* $r->char_sets[nmb] = 'string of avaliable characters for nmb'
134			*
135			* @param integer $len Length of generate string
136			* @param integer $char_set_num Number of char_set selected for use
137			*
138			* @api
139			* @staticvar string $chars
140			*
141			* @return string
142			*/
143			public function genRandomStr($len = 10, $char_set_num = 0)
144			{
145			if (!isset($this->char_sets[$char_set_num]) \|\| $len < 1) {
146			return false;
			0 ignored issues – show Bug Best Practice introduced 2017-07-13 16:03 UTC by Report Bug Copy Issue Report The expression `return false` returns the type `false` which is incompatible with the documented return type `string`. Loading history...
147			} elseif (is_array($this->char_sets[$char_set_num])) {
148			$l = count($this->char_sets[$char_set_num]);
149			} else {
150			$l = \strlen($this->char_sets[$char_set_num]);
151			}
152			$outstr = '';
153			if ($l) {
154			foreach (\unpack('v', call_user_func($this->rnd_fn, $len 2)) as $n) {
155			$outstr .= $this->char_sets[$char_set_num][$n % $l];
156			}
157			}
158			return $outstr;
159			}
160
161			/**
162			* Analog of PHP7-function random_bytes($length) for using under PHP5
163			*
164			* @param integer $length
165			* @return string
166			*/
167			public function genRandomBytes($length)
168			{
169			if ($length > 0) {
170			return \call_user_func($this->rnd_fn, $length);
171			}
172			}
173
174			/**
175			* This function is used to generate bytes if the best functions not found
176			*
177			* @param integer $len
178			* @return string
179			*/
180			public function md5RandomBytes($len)
181			{
182			if ($len>0) {
183			$start = mt_rand(9, PHP_INT_MAX);
184			$output = '';
185			while ($len > 16) {
186			$output .= md5($start++, true);
187			$len-=16;
188			}
189			$output .= substr( md5($start, true), 0, $len);
190			return $output;
191			}
192			}
193			}
194

ierusalim / php-random-gen

RandomStr::genRandomBytes() A last analyzed 2019-05-27 05:09 UTC

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RandomStr::genRandomBytes() A
last analyzed 2019-05-27 05:09 UTC