1.2.32. Ambiguous Array Index¶
Indexes should not be defined with different types than int or string.
Array indices only accept integers and strings, so any other type of literal is reported. In fact, null is turned into an empty string, booleans are turned into an integer, and real numbers are truncated (not rounded).
They are indeed distinct, but may lead to confusion.
<?php
$x = [ 1 => 1,
'1' => 2,
1.0 => 3,
true => 4];
// $x only contains one element : 1 => 4
// Still wrong, immediate typecast to 1
$x[1.0] = 5;
$x[true] = 6;
?>
See also array.
1.2.32.1. Suggestions¶
Only use string or integer as key for an array.
Use transtyping operator (string) and (int) to make sure of the type
1.2.32.2. Specs¶
Short name |
Arrays/AmbiguousKeys |
Rulesets |
|
Exakat since |
0.8.4 |
PHP Version |
All |
Severity |
Minor |
Time To Fix |
Quick (30 mins) |
Precision |
High |
Features |
array |
Examples |
|
Available in |