PHP Skills Tests

Operator precedence

Associativity	Operators	Additional information
non-associative	`clone` `new`	clone and new
left	`[`	array()
right	`**`	arithmetic
right	`++` `--` `~` `(int)` `(float)` `(string)` `(array)` `(object)` `(bool)` `@`	types and increment/decrement
non-associative	`instanceof`	types
right	`!`	logical
left	`*` `/` `%`	arithmetic
left	`+` `-` `.`	arithmetic and stirng
left	`<<` `>>`	bitwise
non-associative	`<` `<=` `>=` `>`	comparison
non-associative	`==` `!=` `===` `!==` `<>` `<=>`	comparison
left	`&`	bitwise and references
left	`^`	bitwise
left	`\|	bitwise
left	&&	http://php.net/manual/en/language.operators.logical.php logical]
left	\|\|	logical
right	??	comparison
left	? :	ternary
right	= += -= *= /= .= %= &= \|= ^= <<= >>= =>	assignment
left	and	logical
left	xor	logical
left	or	logical
left	,`	many uses

TK

echo 0x500;
1280

This is hexidecimal notation. The value is calculated 0 * 1 = 0 + 0 * 16 = 0 + 5 * 256 = 1280.

Example	Name	Result
`$a & $b`	And	Bits that are set in both `$a` and `$b` are set.
`$a \| $b	Or (inclusive or)	Bits that are set in either $a `or` $b`are set.`
$a ^ $b	Xor (exclusive or)	Bits that are set in $a `or` $b`but not both are set.`
~ $a	Not	Bits that are set in $a`are not set, and vice versa.`
$a << $b	Shift left	Shift the bits of $a $b`steps to the left (each step means "multiply by two")`
$a >> $b	Shift right	Shift the bits of $a $b` bits to the right (each step means "divide by two")

Magical constants are constants that change value depending on where in the code they are placed.