1.2.49. Array_merge Needs Array Of Arrays¶
When collecting data to feed array_merge(), use an array of array as default value.
`array(`array()) <https://www.php.net/array>`_`is the neutral value for array_merge();
This analysis also reports when the used types are not an array : array_merge() does not accept scalar values, but only arrays.
Since PHP 7.4, it is possible to call array_merge() without an argument : this means the default value may an empty array.
<?php
// safe default value
$a = array(array());
// when $list is empty, this will trigger an error during array_merge()
foreach($list as $l) {
$a[] = $l;
}
$b = array_merge(...$a);
?>
See also array_merge.
1.2.49.1. Suggestions¶
Use
`array(array())`or`[[]]`as default value for array_merge()Remove any non-array value from the values in the default array
1.2.49.2. Specs¶
Short name |
Structures/ArrayMergeArrayArray |
Rulesets |
|
Exakat since |
2.1.4 |
PHP Version |
With PHP 7.4 and older |
Severity |
Minor |
Time To Fix |
Quick (30 mins) |
Precision |
High |
Features |
array |
Available in |