1.2.525. Hexadecimal In String

Mark strings that may be confused with hexadecimal.

Until PHP 7.0, PHP recognizes hexadecimal numbers inside strings, and converts them accordingly.

PHP 7.0 and until 7.1, converts the string to 0, silently.

PHP 7.1 and later, emits a ‘A non-numeric value encountered’ warning, and convert the string to 0.

<?php
    $a = '0x0030';
    print $a + 1;
    // Print 49

    $c = '0x0030zyc';
    print $c + 1;
    // Print 49

    $b = 'b0x0030';
    print $b + 1;
    // Print 0
?>

See also Integer Syntax.

1.2.525.1. Specs

Short name	Type/HexadecimalString
Rulesets	All, CompatibilityPHP70, CompatibilityPHP71, Inventory
Exakat since	0.8.4
PHP Version	All
Severity	Major
Time To Fix	Slow (1 hour)
Precision	Very high
Features	hexadecimal
Available in	Entreprise Edition, Exakat Cloud