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PHP FAQ

Coding

 What's the difference between & and && by AnakinPt faq434-1431 Posted: 8 Jan 02 in the following piece of code:$a=10 ; //(1010b)$b = 0; // (0000b)if ($a &$b) is different fromif ($a &&$b)The first one is true and the second if false.When we use only one & it means bit-by-bit and operation, so $a &$b=10 (1010b), while when you use && it means and operator of clauses and in this case $a &&$b = 0, cause \$b=0.Beware of the signs. This FAQ is also valid for the or operator ('|'). Back to PHP FAQ Index Back to PHP Forum

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