How to Handle \'Allowed Memory Size Exhausted\' Errors in PHP with Minimal Disruption

Handling 'Allowed Memory Size Exhausted' Errors in PHP

When working with scripts that return JSON responses, encountering the 'Allowed Memory Size Exhausted' error can be a concern. To avoid increasing the memory limit, you may want to inform the user that their request exceeded the memory threshold.

Catching Fatal Errors

In PHP, you can't directly catch fatal errors like the memory size exhaustion. However, you can use the register_shutdown_function to register a callback that checks error_get_last().

<code class="php">register_shutdown_function(function() {
    $error = error_get_last();
    if ($error) {
        echo 'An error occurred: ' . $error['message'];
    }
});</code>

Managing Error Output

To prevent the fatal error from crashing the script, you need to handle the output generated by the offending code. You can use the @ operator (not recommended) or set ini_set('display_errors', false).

Example

<code class="php">ini_set('display_errors', false);
error_reporting(-1);

set_error_handler(function($code, $string, $file, $line){
    throw new ErrorException($string, null, $code, $file, $line);
});

register_shutdown_function(function() {
    $error = error_get_last();
    if ($error) {
        echo 'Memory limit exhausted. Please try reissuing the request with different parameters.';
    }
});</code>

Upon running this script with excessive memory usage, it will output the appropriate error message, notifying the user to make adjustments to reduce memory consumption.

Considerations

Keep error_reporting() high to ensure other errors are still visible. For non-fatal errors, consider using set_error_handler() and ErrorException for error handling.

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