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                <?php  | 
            
                            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Tests.php   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @ignore  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace w3l\Holt45\Tests;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                require_once dirname(__FILE__) . '/holt45.php';  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                class Tests extends \Holt45  | 
            
            
                                                                        
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function allTests()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* $_GET */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (self::chkGet("q")) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            echo '$_GET["q"] is set';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::assignFromGet("q"); // "" or $_GET["q"] | 
            
                            
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                        if (self::chkGetAll(array("q", "search"))) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            echo '$_GET["q"] and $_GET["search"] is set';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* $_POST */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (self::chkPost("q")) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            echo '$_POST["q"] is set';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::assignFromPost("q"); // "" or $_POST["q"] | 
            
                            
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                        if (self::chkPostAll(array("q", "search"))) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            echo '$_POST["q"] and $_POST["search"] is set';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* Sessions */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::sessionSet("example_session_name", "content of session", 86400); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (self::sessionIsset("example_session_name")) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            echo 'Session example_session_name is set and not expired';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::sessionRead("example_session_name"); // content of session | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::sessionDelete("example_session_name"); // Deletes session | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* Time */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::timestampToHttpDate("1980-01-01 17:15:00"); // Tue, 01 Jan 1980 16:15:00 GMT | 
            
                            
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                        echo self::timeElapsed("1980-01-01 17:15:00"); // 13173 days | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* Convert */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::rgbhex(array(255, 0, 0)); // ff0000  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        print_r(self::hexrgb("#FF0000")); // Array([0] => 255, [1] => 0, [2] => 0) | 
            
                            
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                        /* Strings */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::textareaEncode('<textarea id="tex1"></textarea> <p> asdasd </p>'); // [textarea id="tex1"][/textarea] <p> asdasd </p> | 
            
                            
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                        echo self::textareaDecode('[textarea id="tex1"][/textarea] <p> asdasd </p>'); // <textarea id="tex1"></textarea> <p> asdasd </p> | 
            
                            
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                        echo self::obfuscateString("Hi, I'm a ninja!"); // 49574671626d6c75494745676253644a4943787053413d3d | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::deobfuscateString("49574671626d6c75494745676253644a4943787053413d3d"); // Hi, I'm a ninja! | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::replaceString("Hi my name is [@foo] and i like [@bar]", array("foo" => "sven", "bar" => "beer")); // Hi my name is sven and i like beer | 
            
                            
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                        echo self::rainbowText("Hallo world"); // <span style="color: #ff0000;">H</span><span style="color: #ff3300;">a</span>... | 
            
                            
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                        /* Math */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        print_r(self::generatePaginationRange(106, 15, 7)); // Array([0] => 1, [1] => 13, [2] => 14, [3] => 15, [4] => 16, [5] => 17, [6] => 106)  | 
            
                            
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                        /* Misc */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::getClientIpAddress(); // 127.0.0.1  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        print_r(self::urlParser("htt://w.google..com/")); // Array([url] => http://www.google.com/, [url_display] => www.google.com) | 
            
                            
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                        echo self::generatePassword(10); // 2k%=cbot:w  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::generatePassword(10, "simple"); // m9b7gfkmhc  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::iso3166ToName("SE"); // SWEDEN | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* constants */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        echo self::DATA_URI_TRANSPARENT_GIF; // data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7  | 
            
                            
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                        echo self::DATA_URI_TRANSPARENT_PNG; // data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVQYV2NgYAAAAAMAAWgmWQ0AAAAASUVORK5CYII=  | 
            
                            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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The PSR-1: Basic Coding Standard recommends that a file should either introduce new symbols, that is classes, functions, constants or similar, or have side effects. Side effects are anything that executes logic, like for example printing output, changing ini settings or writing to a file.
The idea behind this recommendation is that merely auto-loading a class should not change the state of an application. It also promotes a cleaner style of programming and makes your code less prone to errors, because the logic is not spread out all over the place.
To learn more about the PSR-1, please see the PHP-FIG site on the PSR-1.