PHP VERSION: 8.2.18

preg_replace_callback_array.php


<?php

// preg_replace_callback_array()

// uses preg_replace_callback_array() to update old version of phpLDAPadmin

// looking for instances of "preg_replace('/xxx/e', yyy, zzz)"



// get name of all files in $lib

$lib = __DIR__ . '/phpLDAPadmin/lib/';

$objects = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($lib),

                                         RecursiveIteratorIterator::SELF_FIRST);

$count = 0;

foreach($objects as $name => $fileObj){

    // his is the filename

    if ($fileObj->isFile()) {

        $contents = file($name);

        echo 'Processing: ' . $name . PHP_EOL;

        preg_replace_callback_array(

            [

                // 1   2                 3          4        5

                "!(.*)(preg_replace)\(\'(.*?\/e)\',(\".*?\")(.*)!" =>

                function ($match) {

                    echo 'OLD: ' . PHP_EOL . trim($match[0]) . PHP_EOL;

                    $replace = $match[1]

                            . "preg_replace_callback('"

                            . substr($match[3], 0, -1)

                            . "',"

                            . 'function ($a) { return "\'" . chr(hexdec($a)) . "\'"; }'

                            . $match[5] . PHP_EOL;

                    echo 'NEW:' . PHP_EOL . trim($replace) . PHP_EOL;

                },

                // additional transformations

                // "/pattern/" => function ($match) { // code; },

            ],

            $contents

        );

    }

}

Output

Processing: /homepages/22/d414837955/htdocs/repo/php7_examples/phpLDAPadmin/lib/ds_ldap.php
OLD: 
$a[$key] = preg_replace('/\\\([0-9A-Fa-f]{2})/e',"''.chr(hexdec('\\1')).''",$rdn);
NEW:
$a[$key] = preg_replace_callback('/\\\([0-9A-Fa-f]{2})/',function ($a) { return "'" . chr(hexdec($a)) . "'"; },$rdn);
OLD: 
return preg_replace('/\\\([0-9A-Fa-f]{2})/e',"''.chr(hexdec('\\1')).''",$dn);
NEW:
return preg_replace_callback('/\\\([0-9A-Fa-f]{2})/',function ($a) { return "'" . chr(hexdec($a)) . "'"; },$dn);
Processing: /homepages/22/d414837955/htdocs/repo/php7_examples/phpLDAPadmin/lib/functions.php
OLD: 
$a[$key] = preg_replace('/\\\([0-9A-Fa-f]{2})/e',"''.chr(hexdec('\\1')).''",$rdn);
NEW:
$a[$key] = preg_replace_callback('/\\\([0-9A-Fa-f]{2})/',function ($a) { return "'" . chr(hexdec($a)) . "'"; },$rdn);
OLD: 
return preg_replace('/\\\([0-9A-Fa-f]{2})/e',"''.chr(hexdec('\\1')).''",$dn);
NEW:
return preg_replace_callback('/\\\([0-9A-Fa-f]{2})/',function ($a) { return "'" . chr(hexdec($a)) . "'"; },$dn);

SOURCE CODE