Operator | Name | Result |
---|---|---|

`-$a` |
negation | Opposite of $a. |

`$a + $b` |
addition | Sum of $a and $b. |

`$a - $b` |
Subtraction | Difference of $a and $b. |

`$a * $b` |
Multiplication | Product of $a and $b. |

`$a / $b` |
division | Quotient of $a and $b. |

`$a % $b` |
modulus | Remainder of $a divided by $b. |

`$a ** $b` |
Exponentiation | Result of raising $a to the $bβth power. |

Operator | Name | Result |
---|---|---|

`$a == $b` |
Equal | TRUE if $a is equal to $b after type juggling. |

`$a === $b` |
Identical | TRUE if $a is equal to $b, and they are of the same type. |

`$a != $b` |
Not equal | TRUE if $a is not equal to $b after type juggling. |

`$a <> $b` |
Not equal | TRUE if $a is not equal to $b after type juggling. |

`$a !== $b` |
Not identical | TRUE if $a is not equal to $b, or they are not of the same type. |

`$a < $b` |
Less than | TRUE if $a is strictly less than $b. |

`$a > $b` |
Greater than | TRUE if $a is strictly greater than $b. |

`$a <= $b` |
Less than or equal to | TRUE if $a is less than or equal to $b. |

`$a >= $b` |
Greater than or equal to | TRUE if $a is greater than or equal to $b. |

`$a <=> $b` |
Spaceship | -1 if $a is less than $b, 1 if $a is greater than $b, otherwise 0. |

Operator | Name | Result |
---|---|---|

`! $a` |
Not | TRUE if $a is not TRUE. |

`$a && $b` |
And | TRUE if both $a and $b are TRUE. |

`$a || $b` |
Or | TRUE if either $a or $b is TRUE. |

`$a and $b` |
And | Like `&&` but precedence is lower. |

`$a or $b` |
Or | Like `||` but precedence is lower. |

`$a xor $b` |
Xor | TRUE if either $a or $b is TRUE, but not both. |

The simple-assignment operator `=`

assigns its right operand to its left operand.

```
<?php
$a = 1;
echo $a; // 1
```

The compound-assignment operators combine the simple-assignment operator with another binary operator. Compound-assignment operators perform the operation specified by the additional operator, then assign the result to the left operand.

Operator | Shorthand | Meaning |
---|---|---|

`+=` |
`$x += $y` |
`$x = $x + $y` |

`-=` |
`$x -= $y` |
`$x = $x - $y` |

`*=` |
`$x *= $y` |
`$x = $x * $y` |

`/=` |
`$x /= $y` |
`$x = $x / $y` |

`%=` |
`$x %= $y` |
`$x = $x % $y` |

`**=` |
`$x **= $y` |
`$x = $x ** $y` |

`.=` |
`$x .= $y` |
`$x = $x . $y` |

`<<=` |
`$x <<= $y` |
`$x = $x << $y` |

`>>=` |
`$x >>= $y` |
`$x = $x >> $y` |

`&=` |
`$x &= $y` |
`$x = $x & $y` |

`^=` |
`$x ^= $y` |
`$x = $x ^ $y` |

`|=` |
`$x |= $y` |
`$x = $x | $y` |