PHP generates random string custom functions

PHP generates random string custom functions in a detailed description

/** * Generate random String * @param int       $length  The random string length to be generated * @param string    $type    random code type: 0, digit + capital letter, 1, number; 2, lowercase letter; 3, Uppercase letters, 4, special characters;-1, digits + uppercase and lowercase letters + special characters * @return string */function randcode ($length = 5, $type = 0) {    $arr = array (1 = "0123 456789 ", 2 =" ABCDEFGHIJKLMNOPQRSTUVWXYZ ", 3 =" ABCDEFGHIJKLMNOPQRSTUVWXYZ ", 4 =" ~@#$%^&* () {}[]| ");    if ($type = = 0) {        array_pop ($arr);        $string = Implode ("", $arr);    } else if ($type = = "-1") {        $string = implode ("", $arr);    } else {        $string = $arr [$type];    }    $count = strlen ($string)-1;    for ($i = 0; $i < $length; $i + +) {        $str [$i] = $string [rand (0, $count)];        $code. = $str [$i];    }    return $code;}

Let's start by talking about the function

Use Randcode () to call this function, and then pass in the parameters, $length to generate a random string length, is the number of characters, $type to generate the type of string, according to the function is written in 4 kinds of, of course, you can also add other types in, that is, The characters that are generated by each type of string are determined by the characters contained in the array.

Below is the thinkphp frame, I feel particularly strong, can recommend to everyone

/** * generates random strings that can be used to automatically generate passwords default lengths of 6-bit letters and numbers mixed with * @param string $len length * @param string $type strings type * 0 Letters 1 numbers other mixed * @param string    $addChars Extra characters * @return string */function rand_string ($len =6, $type = ', $addChars = ') {$str = ';            Switch ($type) {case 0: $chars = ' abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz '. $addChars;        Break            Case 1: $chars = str_repeat (' 0123456789 ', 3);        Break            Case 2: $chars = ' abcdefghijklmnopqrstuvwxyz '. $addChars;        Break            Case 3: $chars = ' abcdefghijklmnopqrstuvwxyz '. $addChars;        Break Case 4: $chars = "I'm going to do it when he's going to do it. 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$addChars;        Break Default://defaults to remove easily confusing characters Ooll and number 01, to add please use the Addchars parameter $chars = ' ABCDEFGHIJKMNPQRSTUVWXYZABCDEFGHIJKMNPQR            stuvwxyz23456789 '. $addChars;    Break    if ($len >10) {//The number of bits is too long to repeat the string $chars = $type ==1? str_repeat ($chars, $len): Str_repeat ($chars, 5);        } if ($type!=4) {$chars = Str_shuffle ($chars);    $str = substr ($chars, 0, $len); }else{//Chinese random word for ($i =0; $i < $len; $i + +) {$str. = Msubstr ($chars, Floor (Mt_rand) (0,mb_strlen ($chars,        ' Utf-8 ')-1)), 1); }} return $str;}

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