PHP Operators

arithmetic

bitwise

null coalescing

comparison

!$a

Logical not

Tags
Related
$a && $b $a || $b 
$a = true;

!$a; // false

$b = false;

!$b; // true

// Also works with truthy and falsy values:
1 || 0; // true
0 || ''; // false
 1.0+

generators

strings