这个PHP中的异常处理？

Question

How can I handle an exception in PHP? As an example, in the code like this:

<?php
   $a=5;
   $b=0
   $c=($a/$b);
   echo $c;
?>

Please help me.

Answer 1

PHP raises warnings and error messages not by throwing an exception, therefore you cannot catch anything here. However, you can modify this behaviour:

// Register a custom error handler that throws an ErrorException
// whenever a warrning or error occurs
set_error_handler(function ($errno, $errstr, $errfile, $errline ) {
    throw new ErrorException($errstr, 0, $errno, $errfile, $errline);
});

$a = 5;
$b = 0;

// Now a division by zero will result into an ErrorException being thrown
try {
    $c = $a / $b;
    echo $c;
} catch (ErrorException $e) {
    echo 'Error: ' . $e->getMessage();
}