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a few questions
Posted: Sat Mar 25, 2006 2:13 am
by s.dot
A few things I've been wondering for a while
$foo &= $bar
what's this?
if($a === $b)
if($a !== $b)
why three comparison operators?
$$var
why two $s?
Posted: Sat Mar 25, 2006 2:30 am
by feyd
- &= is a bitwise operator. It means L-value = L-value & R-value
- === is the identity operator. It's similar to == the equality operator, but also requires the type of the operands to be the same. Same sort of thing for !== being the types must match as well as the values to fail.
Code: Select all
'1' == 1; // true
'1' === 1; // false
'1' != 1; // false
'1' !== 1; // true
- $$var is variable variables. The value in $var is considered the name of a variable thus accessed or set (depending on context)
Code: Select all
$foo = 'bar';
$$foo = 64;
echo $bar;