Online PHP editor | output for oHsOk

@ 2018-09-25T15:57:11Z

<?php
$data = [
    [
     'blah' => 'reference',
    ],
    [
        
     'A' => 'SMI13', 
     'B'  => '03/12/1940', 
     'C' => '',
    ]
 ];

foreach($data as &$record){

    foreach($record as $key => $val){
        //you might want to consider using preg_replace_callback instead:
        if(preg_match("/^(((0[13578]|1[02])\/(0[1-9]|[12]\d|3[01])\/((19|[2-9]\d)\d{2}))|((0[13456789]|1[012])\/(0[1-9]|[12]\d|30)\/((19|[2-9]\d)\d{2}))|(02\/(0[1-9]|1\d|2[0-8])\/((19|[2-9]\d)\d{2}))|(02\/29\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$/",$val)) {
                echo "match! $val \n";
                $record [$key] = date("Y-m-d", strtotime($val));
        }
     
    }
}
unset($record);
var_dump($data);

Output for 5.6.38, 7.1.0 - 7.1.22, 7.2.0 - 7.2.33, 7.3.16 - 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 - 8.3.4, 8.3.6: match! 03/12/1940 array(2) { [0]=> array(1) { ["blah"]=> string(9) "reference" } [1]=> array(3) { ["A"]=> string(5) "SMI13" ["B"]=> string(10) "1940-03-12" ["C"]=> string(0) "" } }
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 match! 03/12/1940 array(2) { [0]=> array(1) { ["blah"]=> string(9) "reference" } [1]=> array(3) { ["A"]=> string(5) "SMI13" ["B"]=> string(10) "1940-03-12" ["C"]=> string(0) "" } }

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