Why does isset() not work as expected, even with the @ symbol?

The issue with using isset() with the @ symbol is that the @ symbol suppresses errors, including notices generated by isset(). This means that even if a variable is not set, isset() will not throw an error when used with the @ symbol. To solve this issue, you can check if the variable is set using the traditional method without the @ symbol. 

// Incorrect usage of isset() with @ symbol
@$variable = 'value';
if(isset($variable)){
    echo 'Variable is set.';
} else {
    echo 'Variable is not set.';
}

// Correct way to check if a variable is set
$variable = 'value';
if(isset($variable)){
    echo 'Variable is set.';
} else {
    echo 'Variable is not set.';
}

Keywords

isset @ symbol error handling PHP function variable checking

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