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<?php
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namespace Faker\Extension;
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/**
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* A class with some methods that may make building extensions easier.
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*
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* @experimental This class is experimental and does not fall under our BC promise
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*/
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final class Helper
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{
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/**
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* Returns a random element from a passed array.
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*/
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public static function randomElement(array $array)
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{
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if ($array === []) {
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return null;
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}
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return $array[array_rand($array, 1)];
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}
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/**
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* Replaces all hash sign ('#') occurrences with a random number
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* Replaces all percentage sign ('%') occurrences with a non-zero number.
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*
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* @param string $string String that needs to bet parsed
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*/
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public static function numerify(string $string): string
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{
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// instead of using randomDigit() several times, which is slow,
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// count the number of hashes and generate once a large number
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$toReplace = [];
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if (($pos = strpos($string, '#')) !== false) {
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for ($i = $pos, $last = strrpos($string, '#', $pos) + 1; $i < $last; ++$i) {
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if ($string[$i] === '#') {
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$toReplace[] = $i;
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}
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}
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}
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if ($nbReplacements = count($toReplace)) {
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$maxAtOnce = strlen((string) mt_getrandmax()) - 1;
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$numbers = '';
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$i = 0;
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while ($i < $nbReplacements) {
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$size = min($nbReplacements - $i, $maxAtOnce);
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$numbers .= str_pad((string) mt_rand(0, 10 ** $size - 1), $size, '0', STR_PAD_LEFT);
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$i += $size;
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}
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for ($i = 0; $i < $nbReplacements; ++$i) {
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$string[$toReplace[$i]] = $numbers[$i];
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}
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}
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return self::replaceWildcard($string, '%', static function () {
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return mt_rand(1, 9);
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});
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}
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/**
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* Replaces all question mark ('?') occurrences with a random letter.
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*
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* @param string $string String that needs to bet parsed
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*/
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public static function lexify(string $string): string
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{
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return self::replaceWildcard($string, '?', static function () {
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return chr(mt_rand(97, 122));
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});
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}
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/**
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* Replaces hash signs ('#') and question marks ('?') with random numbers and letters
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* An asterisk ('*') is replaced with either a random number or a random letter.
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*
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* @param string $string String that needs to bet parsed
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*/
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public static function bothify(string $string): string
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{
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$string = self::replaceWildcard($string, '*', static function () {
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return mt_rand(0, 1) ? '#' : '?';
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});
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return static::lexify(static::numerify($string));
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}
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private static function replaceWildcard(string $string, string $wildcard, callable $callback): string
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{
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if (($pos = strpos($string, $wildcard)) === false) {
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return $string;
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}
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for ($i = $pos, $last = strrpos($string, $wildcard, $pos) + 1; $i < $last; ++$i) {
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if ($string[$i] === $wildcard) {
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$string[$i] = call_user_func($callback);
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}
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}
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return $string;
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}
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}
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