Strange behaviour with numbers that have a leading zero [duplicate]

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If you simply write 08 and 09 (without quotes) or any other numeric with a leading 0, PHP believes you’re writing an octal value, and 08 and 09 are invalid octal numbers.

http://www.php.net/manual/en/language.types.integer.php

Syntax

Integers can be specified in decimal (base 10), hexadecimal (base 16),
octal (base 8) or binary (base 2) notation, optionally preceded by a
sign (- or +).

Binary integer literals are available since PHP 5.4.0.

To use octal notation, precede the number with a 0 (zero). To use
hexadecimal notation precede the number with 0x. To use binary
notation precede the number with 0b.

[…]

Warning:
Prior to PHP 7, if an invalid digit was given in an octal integer (i.e. 8 or 9), the rest of the number was ignored. Since PHP 7, a parse error is emitted.

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