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@ 2018-07-24T13:29:25Z

<?php
$array = [
    'field_5abcb693a68bc' => [
        0 => [
            'field_5abcbb1b51ddf' => 'mortgage',
            'field_5ae58a0b58b58' => '',
            'field_5abcbb1e51de0' => '10',
            'field_5abcbb2051de1' => 'הידגלה',
            'field_5abcbb2351de2' => '45,654,456',
            'field_5abcbb6251de3' => '',
            'field_5abcbb6651de4' => '04/2017',
            'field_5abcbb6851de5' => '4,454,656',
            'field_5abcbb6b51de6' => '24/07/2018',
            'field_5abcbbb351de7' => '657',
            'field_5abcbbb651de8' => '24/07/2018',
            'field_5abcbbb851de9' => '15',
            'field_5abcbbbb51dea' => 'yes'
        ]
    ]
];

foreach ($array as &$set) {
    foreach ($set as &$subset) {
        $subset = preg_replace('~^\d[1-9]/[1-9]\d{3}$~', '01/$0', $subset);
    }
}
unset($set, $subset); // avoid future variable interferences
var_export($array);

Output for git.master, git.master_jit, rfc.property-hooks: array ( 'field_5abcb693a68bc' => array ( 0 => array ( 'field_5abcbb1b51ddf' => 'mortgage', 'field_5ae58a0b58b58' => '', 'field_5abcbb1e51de0' => '10', 'field_5abcbb2051de1' => 'הידגלה', 'field_5abcbb2351de2' => '45,654,456', 'field_5abcbb6251de3' => '', 'field_5abcbb6651de4' => '01/04/2017', 'field_5abcbb6851de5' => '4,454,656', 'field_5abcbb6b51de6' => '24/07/2018', 'field_5abcbbb351de7' => '657', 'field_5abcbbb651de8' => '24/07/2018', 'field_5abcbbb851de9' => '15', 'field_5abcbbbb51dea' => 'yes', ), ), )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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