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January 16, 2016 16:21
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Smarter preg_replace with support for callback functions and the removed /e modifier.
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<?php | |
function preg_replace_safe($search, $replace, $subject, $evaluator = NULL) { | |
if (is_null($evaluator)) { | |
// A custom evaluator | |
// function($c) { return eval($c); } | |
// is required if the replacement code uses the $this reference. | |
$evaluator = function($code) { return eval($code); }; | |
} | |
if (is_array($subject)) { | |
return array_map(function($subject) use ($search, $replace) { | |
return preg_replace_safe($search, $replace, $subject); | |
}, $subject); | |
} else { | |
if (is_array($search) && is_array($replace)) { | |
$replacements = array_map(function($a, $b) { return [$a, $b]; }, $search, $replace); | |
} else if(is_array($search)) { | |
$replacements = array_map(function($a) use($replace) { return [$a, $replace]; }, $search); | |
} else { | |
$replacements = [[$search, $replace]]; | |
} | |
foreach ($replacements as $replacement) { | |
list ($s, $r) = $replacement; | |
if (is_callable($r)) { | |
$subject = preg_replace_callback($s, $r, $subject); | |
} else { | |
$stripped = preg_replace('/^(.)(.*\\1[a-z]*)e([a-z]*)$/si', "$1$2$3", $s); | |
if ($stripped != $s) { | |
$subject = preg_replace_callback($stripped, function($matches) use ($r, $evaluator) { | |
$code = preg_replace_callback('/\\$(?|\{(\\d+)\}|(\\d+))/', function($m) use ($matches) { | |
return addslashes($matches[(int) $m[1]]); | |
}, $r); | |
return $evaluator('return ' . $code . ';'); | |
}, $subject); | |
} else { | |
$subject = preg_replace($s, $r, $subject); | |
} | |
} | |
} | |
return $subject; | |
} | |
} |
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