Error handling methods in PHP scripts (PHP Practical Manual Reading Notes)

What information should be output?

In the process of running PHP scripts, a variety of problems may occur, including user-level errors and system-level errors. These errors are useful to developers, but not necessarily to users. Useful (but users still want to see some error descriptive information), so how do we display these error messages?
Our processing method here is: define a switch variable. When this variable is in the "on" state, we output the error message. When the variable is in the "off" state, we ignore the error message. Here we pass a function to achieve this function

<code>define(“DEBUG_MODE”,<span>true</span>);

<span><span>function</span><span>debug_print</span><span>(<span>$message</span>)</span>
{</span><span>if</span>(DEBUG_MODE)
    {
        <span>echo</span><span>$message</span>
    }
}</code>

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In this way, we can control the output of information.

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Where is the error message output?

When writing PHP scripts, we usually implement a unified error message output page first. When the PHP script runs with an error, we will jump to this error page. So how is this error jump function implemented? , look at the code:

<code><span><span>function</span><span>handle_error</span><span>(<span>$usr_error_message</span>, <span>$system_error_message</span>)</span>
{</span>
    header(<span>"Location:show_error.php?error_message={$usr_error_message}&system_error_message={$system_error_message}"</span>);
}</code>

In this way, we can process the error information in the unified error output page show_error.php file.

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