1.2.48. Array_Map() Passes By Value¶
array_map() requires the callback to receive elements by value. Unlike array_walk(), which accepts by value or by reference, depending on the action taken.
PHP 8.0 and more recent emits a Warning
<?php
// Example, courtery of Juliette Reinders Folmer
function trimNewlines(&$line, $key) {
$line = str_replace(array("\n", "\r" ), '', $line);
}
$original = [
"text\n\n",
"text\n\r"
];
$array = $original;
array_walk($array, 'trimNewlines');
var_dump($array);
array_map('trimNewlines', $original, [0, 1]);
?>
See also array_map.
1.2.48.1. Suggestions¶
Make the callback first argument a reference
1.2.48.2. Specs¶
Short name |
Structures/ArrayMapPassesByValue |
Rulesets |
|
Exakat since |
2.2.0 |
PHP Version |
All |
Severity |
Major |
Time To Fix |
Quick (30 mins) |
Precision |
Medium |
Features |
array, map, by-value, by-reference |
Available in |