We have two variables (parameters) “x” & “y”, here we do swap of two variables without using a third variable (parameters).

**1) Swap numbers using Arithmetic Operators –**

In below example we use addition and subtraction operation to do swap of 2 numbers

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<?php function swap_me() { $x = 25; $y = 14; echo "Before Swapping: x = ".$x.", y = ".$y; // Code to swap "$x" and "$y" $x = $x + $y; // $x now becomes 39 $y = $x - $y; // $y becomes 25 $x = $x - $y; // $x becomes 14 echo "<BR>After Swapping: x = ".$x.", y = ".$y; } // call the function swap_me(); ?> Output: Before Swapping: x = 25, y = 14 After Swapping: x = 14, y = 25 |

In below example we use multiplication and division operation to do swap of 2 numbers

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<?php function swap_me() { $x = 25; $y = 14; echo "Before Swapping: x = ".$x.", y = ".$y; // Code to swap "$x" and "$y" $x = $x * $y; // x now becomes 350 $y = $x / $y; // y becomes 25 $x = $x / $y; // x becomes 14 echo "<BR>After Swapping: x = ".$x.", y = ".$y; } // call the function swap_me(); ?> Output: Before Swapping: x = 25, y = 14 After Swapping: x = 14, y = 25 |

**2) Swap numbers using Bitwise XOR Operators –**

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<?php function swap_me() { $x = 25; $y = 14; echo "Before Swapping: x = ".$x.", y = ".$y; // Code to swap 'x' (11001) and 'y' (1110) $x = $x ^ $y; // x now becomes 15 (100111) $y = $x ^ $y; // y becomes 10 (11001) $x = $x ^ $y; // x becomes 5 (1110) echo "<BR>After Swapping: x = ".$x.", y = ".$y; } // call the function swap_me(); ?> Output: Before Swapping: x = 25, y = 14 After Swapping: x = 14, y = 25 |

**Note:**

In multiplication, we can not able to use 0 (zero), because of it make multiplication result as zero.

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Till than Happy Coding ðŸ™‚