Essential Books

Combined Assignment etc

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The combined assignment operators are a shortcut for an operation on some variable and subsequently assigning this new value to that variable.

Arithmetic: 

$a = 1;   // basic assignment
$a += 2; // read as '$a = $a + 2'; $a now is (1 + 2) => 3
$a -= 1; // $a now is (3 - 1) => 2
$a *= 2; // $a now is (2 * 2) => 4
$a /= 2; // $a now is (16 / 2) => 8
$a %= 5; // $a now is (8 % 5) => 3 (modulus or remainder)

// array +
$arrOne = array(1);
$arrTwo = array(2);
$arrOne += $arrTwo;

Processing Multiple Arrays Together 

$a **= 2; // $a now is (4 ** 2) => 16 (4 raised to the power of 2)

Combined concatenation and assignment of a string: 

$a = "a";
$a .= "b"; // $a => "ab"

Combined binary bitwise assignment operators: 

$a = 0b00101010;  // $a now is 42
$a &= 0b00001111; // $a now is (00101010 & 00001111) => 00001010 (bitwise and)
$a |= 0b00100010; // $a now is (00001010 | 00100010) => 00101010 (bitwise or)
$a ^= 0b10000010; // $a now is (00101010 ^ 10000010) => 10101000 (bitwise xor)
$a >>= 3;         // $a now is (10101000 >> 3) => 00010101 (shift right by 3)
$a <<= 1;         // $a now is (00010101 << 1) => 00101010 (shift left by 1)
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Operators:
* Operators
* Null Coalescing Operator
* Spaceship Operator
* Execution Operator
* Incrementing and Decrementing Operators --
* Ternary Operator
* Logical Operators AND and OR
* String Operators . and .
* Object and Class Operators
* Combined Assignment etc
* Altering operator precedence with parentheses
* Association
* Basic Assignment
* Comparison Operators
* Bitwise Operators
* instanceof type operator
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