Code Inspection: Illegal string offset
Reports the usages of non-integer offsets in string access expressions such as $str[42].
Starting from PHP 5.4, string offsets have to be either integers or integer-like strings. Since it's considered bad practice to use strings as a string offset, the inspection reports them, as well.
See String access and modification by character (php.net) for details.
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Last modified: 16 July 2021