What is the difference between implicit != and explicit !== in PHP comparison operators and when should each be used?

In PHP, the "!=" operator is used for implicit type conversion while the "!== operator is used for strict comparison without type conversion. When using "!=" PHP will attempt to convert the operands to the same type before comparing them, while "!== will compare both the value and the type of the operands. It is generally recommended to use "!== for strict comparison to avoid unexpected results due to type coercion. 

// Implicit comparison
$value1 = "10";
$value2 = 10;

if ($value1 != $value2) {
    echo "Values are not equal";
}

// Explicit comparison
if ($value1 !== $value2) {
    echo "Values are not strictly equal";
}

Keywords

PHP comparison operators implicit explicit !==

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