Safely catch a ‘Allowed memory size exhausted’ error in PHP

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As this answer suggests, you can use register_shutdown_function() to register a callback that’ll check error_get_last().

You’ll still have to manage the output generated from the offending code, whether by the @ (shut up) operator, or ini_set('display_errors', false)

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(null !== $error)
        {
            echo 'Caught at shutdown';
        }
    });

try
{
    while(true)
    {
        $data .= str_repeat('#', PHP_INT_MAX);
    }
}
catch(\Exception $exception)
{
    echo 'Caught in try/catch';
}

When run, this outputs Caught at shutdown. Unfortunately, the ErrorException exception object isn’t thrown because the fatal error triggers script termination, subsequently caught only in the shutdown function.

You can check the $error array in the shutdown function for details on the cause, and respond accordingly. One suggestion could be reissuing the request back against your web application (at a different address, or with different parameters of course) and return the captured response.

I recommend keeping error_reporting() high (a value of -1) though, and using (as others have suggested) error handling for everything else with set_error_handler() and ErrorException.

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