What is the use of the @ symbol in PHP?

PHP supports the error control operator (@), which suppresses error messages when prepended to an expression. Any error messages that might be generated by that expression are ignored, though the script continues executing.

Basic Syntax

The @ symbol is placed directly before the expression that might generate an error ?

<?php
    // Without @ - would show error
    $value = $undefined_array['key'];
    
    // With @ - suppresses error
    $value = @$undefined_array['key'];
    
    echo "Script continues executing";
?>

PHP Notice: Undefined variable: undefined_array in /home/cg/root/6985034/main.php on line 3
Script continues executing

Common Use Cases

File Operations

Suppressing file operation errors while providing custom error handling ?

<?php
    $content = @file_get_contents('non_existent_file.txt');
    
    if ($content === false) {
        echo "Failed to read file - custom error message";
    } else {
        echo $content;
    }
?>

Failed to read file - custom error message

Array Access

Preventing notices when accessing potentially undefined array keys ?

<?php
    $data = ['name' => 'John'];
    
    // Without @ - would show notice
    echo "Age: " . $data['age'] . "<br>";
    
    // With @ - suppresses notice
    $age = @$data['age'] ?? 'Unknown';
    echo "Age with @: " . $age;
?>

PHP Notice: Undefined index: age in /home/cg/root/6985034/main.php on line 5
Age: 
Age with @: Unknown

Important Considerations

Conclusion

The @ operator suppresses PHP error messages but should be used judiciously. It's best combined with proper error checking to maintain code reliability while preventing unwanted error output.