What\'s the Difference Between \'&=\' and \'&&=\' in PHP?

Unveiling the Significance of '&=' and '&=' Operators in PHP

PHP's expansive operator library encompasses two often overlooked symbols, '&=' and '&&=', which serve distinct purposes.

"&=" Operator: Reference Assignment

The '&=' operator signifies reference assignment, connecting two variables such that any changes made to one variable are instantly reflected in the other. This differs from a typical assignment, where a new memory location is allocated for the assigned value.

Example:

<code class="php">$a = 5;
$b =& $a;
$a = 10; // Both $a and $b now hold the value 10</code>

"&&=" Operator: Bitwise And

The '&&=' operator performs a bitwise AND operation between its operands. It逐位compares the binary representations of its operands, resulting in a new value where each bit is set to 1 only if both corresponding bits in the operands are set to 1.

Example:

<code class="php">$a = 10; // 1010 in binary
$b = 5;  // 0101 in binary
$a &&= $b; // Result is 0000 (0 in decimal)</code>

Additional Resources

For further information on these operators, refer to the following resources:

• [PHP Bitwise Operators](https://www.php.net/manual/en/language.operators.bitwise.php)
• [PHP Reference Operator](https://www.php.net/manual/en/language.references.php)

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