3v4l.org

run code in 300+ PHP versions simultaneously

@ 2014-08-01T17:03:50Z

<?php


foreach (cartesian(expand_pattern('a..c'), 3) as $option) {
	echo "$option\n";
}
	
	
function expand_pattern($pattern) {
    $bias = 0;
    $flags = PREG_SET_ORDER | PREG_OFFSET_CAPTURE;
    preg_match_all('/(.)\.\.(.)/', $pattern, $matches, $flags);
    foreach ($matches as $match) {
        $range = implode('', range($match[1][0], $match[2][0]));
        $pattern = substr_replace(
            $pattern, 
            $range, 
            $bias + $match[1][1],
            $match[2][1] - $match[1][1] + 1);
        $bias += strlen($range) - 4;
    }
 
    return $pattern;
}
 
function cartesian($pattern, $length) {
    $choices = strlen($pattern);
    $indexes = array_fill(0, $length, 0);
    $resets = 0;
 
    while ($resets != $length) {
        $result = '';
        for ($i = 0; $i < $length; ++$i) {
            $result .= $pattern[$indexes[$i]];
        }
        yield $result;
 
        $resets = 0;
        for ($i = $length - 1; $i >= 0 && ++$indexes[$i] == $choices; --$i) {
            $indexes[$i] = 0;
            ++$resets;
        }
    }
}

Output for 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: aaa aab aac aba abb abc aca acb acc baa bab bac bba bbb bbc bca bcb bcc caa cab cac cba cbb cbc cca ccb ccc
Output for 5.4.0 - 5.4.45: Parse error: syntax error, unexpected '$result' (T_VARIABLE) in /in/88FC2 on line 36
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected T_VARIABLE in /in/88FC2 on line 36
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_VARIABLE in /in/88FC2 on line 36
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error in /in/88FC2 on line 36
Process exited with code 255.

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