The == operator in PHP compares whether the values of two expressions are equal. It compares values and types according to rules, performs type conversions to match unequal types, and returns true (equal) or false (not equal). Unlike the === operator, the latter does not convert types and returns true only if the value and type are equal.
The meaning of == in PHP
== in PHP is an equality comparison operator, used for comparison Whether the values of two expressions are equal.
Usage
== operator compares two expressions according to the following rules:
- If the values of the expressions are of the same type (e.g., integers, strings, floating point numbers), their values are compared directly.
- If the expressions are of different types, PHP will convert one of the types to match the other.
- The comparison result will be true (equal) or false (not equal).
The difference between ===
There is another equality comparison operator === in PHP, which is similar to ==, but more advanced strict. === does not perform a type conversion and returns true only if the expressions are equal in value and type.
Examples
Here are some examples of using the == operator:
var_dump(1 == 1); // 输出:true var_dump("foo" == "foo"); // 输出:true var_dump(1.0 == 1); // 输出:true var_dump(true == 1); // 输出:true
It should be noted that the following comparisons will return false because they have different values or types:
var_dump(1 == "1"); // 输出:false var_dump(1.0 == 1.1); // 输出:false var_dump(true == false); // 输出:false
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