The difference between = and == in php

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Release: 2024-04-27 12:12:22
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In PHP, = and == are different operators. = is used to assign a value and returns the assigned value, while == is used to compare whether two values ​​are equal and return a Boolean value. == is type-sensitive, = is not.

The difference between = and == in php

##The difference between = and == in PHP

In PHP,

= and == are two different operators with different uses and meanings.

= Operator

  • Assignment Operator: is used to assign a value to a variable.
  • Syntax: $variable = value;
  • Example: $name = 'John';

== Operator

  • Equality comparison operator: is used to compare whether two values ​​are equal.
  • Syntax: $value1 == $value2;
  • Example: if ($name == 'John') {

Difference

The main difference is:

  • Function: = is used for assignment and == is used for comparison.
  • Operation results: = returns the assigned value, while == returns a Boolean value (true or false).
  • Type Sensitivity: == is type sensitive, which means it takes into account the type of the value, while = does not.

Type sensitivity

    When comparing two variables of different types,
  • == will convert them to Same type and compare.
  • = The type will not be converted and the original type will be maintained during allocation.

Example:

<code class="php">$number = 10;
$string = '10';

if ($number == $string) {
  echo 'Equal'; // 输出 "Equal"
}

if ($number = $string) {
  echo 'Equal'; // 错误,意外的分配
}</code>
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In the first example,

== is converted to the same type (string), while in the first example = in both examples will cause allocation errors.

When to use

    When you need to assign a value, use
  • =.
  • When you need to compare two values ​​for equality, use
  • ==.

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