PHP bool false with value 0

PHP bool false and numeric 0

Ext.: http://home.phpchina.com/space.php?uid=108724&do=blog&id=54899

PHP is a loose-type language, which means that the Boolean value false and the integer value 0 are treated the same (even C also treats 0 and false as equivalent). You can use the script to determine the equivalence between 0 and Boolean? False:

?

? $test _var = 0;
if ($test _var = = False) {
?? echo "Yes";
?} else{
?? echo "No";
?}
?

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Output: Yes

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? $test _var = 0;
? if ($test _var!== false) {
?? echo "Yes";
?} else{
?? echo "No";
?}
?>

?

Output: Yes

?

_________________________________________________________________

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The problem is that the Boolean value false and the integer value 0 are obviously different.

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PHP has a GetType () function that gets the type of the variable. You can use the = = = Operator (bullish, with three equals). The difference between the and = = operators is that the operator compares both the value and the type of the data .

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When the termination condition involves different variable types, use the. = = = and?! The = = operator is important for strong type checking.

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