PHP Operators

[brendt]

Arithmetic

• +$a: Convert $a to int or float
• -$a: Convert $a to int or float and invert the sign
• $a + $b: Add $a and $b
• $a - $b: Subtract $b from $a
• $a * $b: Multiply $a and $b
• $a / $b: Divide $a by $b
• $a % $b: Remainder of $a divided by $b
• $a ** $b: Raising $a the the $bth power
• $a++: Return $a, then increment by one
• ++$a: Increment by one, then return $a
• $a--: Return $a, then decrement by one
• --$a: Decrement by one, then return $a
• $a += $b: Shorthand for $a = $a + $b
• $a -= $b: Shorthand for $a = $a - $b
• $a *= $b: Shorthand for $a = $a * $b
• $a /= $b: Shorthand for $a = $a / $b
• $a %= $b: Shorthand for $a = $a % $b

Comparison

• $a == $b: Equality with type juggling
• $a != $b: No equality with type juggling
• $a <> $b: No equality with type juggling
• $a === $b: Equality without type juggling
• $a !== $b: No equality without type juggling
• $a < $b: $a is less then $b
• $a <= $b: $a is less then or equal to $b
• $a > $b: $a is greater then $b
• $a >= $b: $a is greater then or equal to $b
• $a && $b: $a and $b
• $a and $b: Alias for &&
• $a || $b: $a or $b
• $a or $b: Alias for ||
• $a xor $b: $a or $b, but not both
• !$a: Not $a
• $a <=> $b: An int less than, equal to, or greater than zero when $a is less than, equal to, or greater than $b, respectively.
• $a ? $b : $c: Ternary operator

Null coalescing

• $a ?? $b: Null coalescing
• $a ??= $b: Shorthand for $a = $a ?? $b

Bitwise

• $a & $b: Binary and
• $a | $b: Binary or
• $a ^ $b: Binary xor
• ~$a: Binary not
• $a << $b: Bitshift left (each step means "multiply by two")
• $a >> $b: Bitshift right (each step means "divide by two")
• $a &= $b: Shorthand for $a = $a & $b
• $a |= $b: Shorthand for $a = $a | $b
• $a ^= $b: Shorthand for $a = $a ^ $b
• $a <<= $b: Shorthand for $a = $a << $b
• $a >>= $b: Shorthand for $a = $a >> $b

Strings

• $a . $b: Concat $a and $b
• "{$a} {$b}": Interpolate $a and $b in the same string
• $a .= $b: Shorthand for $a = $a . $b

Generators

• yield: Yield a value from a generator
• yield from

[brendt]

The idea is that I'll provide a description and one or more code samples per operator. Ideally we'd also link to the official PHP documentation.

@willemvb what seems the most easiest to me is that you come up with a design, and I fill it in with real data, so that you won't have to be bothered with copy pasting, and that I can directly write it in the proper context. What do you think?

[willemvb]

@brendt sounds good! Hopefully I can squeeze this in week 49 or 50… sooner will be difficult.