Home > Article > Backend Development > What\'s the Difference: =, ==, and === in PHP?
Understanding the Differences: =, ==, and === in PHP
When working with variables in PHP, you'll encounter three comparison operators: =, ==, and ===. These operators facilitate variable assignment and comparisons.
= (Assignment Operator)
The single equals sign (=) is the assignment operator in PHP. It assigns the value on its right-hand side to the variable on its left-hand side. For instance:
<code class="php">$a = 10; // Assigns the value 10 to the variable $a $b = $a + 5; // Assigns the result of $a + 5 to the variable $b</code>
== (Equal Comparison Operator)
The double equals sign (==) is the equal comparison operator. It checks if the values on both sides of the operator are equal. However, it does not consider the data types.
<code class="php">$a = 10; $b = "10"; var_dump($a == $b); // Output: true (true because the values are equal)</code>
=== (Identical Comparison Operator)
The triple equals sign (===) is the identical comparison operator. It checks if the values on both sides of the operator are equal and of the same data type.
<code class="php">$a = 10; $b = "10"; var_dump($a === $b); // Output: false (false because the values are not of the same data type)</code>
Key Differences
When to Use Each Operator
The above is the detailed content of What\'s the Difference: =, ==, and === in PHP?. For more information, please follow other related articles on the PHP Chinese website!