Thủ Thuật về Why does php not show errors? 2022
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I installed XAMPP 1.7.4 (with PHP 5.3.5), the problem is PHP does not display any error messages. E.g. if I connect to MYSQL with mysql_connect() without parameters, PHP will not complain about the required fields.
Nội dung chính
- Quickly
Show All PHP Errors - Configure PHP.ini to Display All Errors
- Display PHP Errors via .htaccess Configuration
- Enable Detailed Warnings and Notices
- In-depth With the error_reporting() function
- Log PHP
errors to a file using the error_log() function - Log PHP Errors Through the Web Server Configuration
- Automatically Collect PHP Errors With Retrace APM
- How do I find PHP errors?
- Can we hide errors in PHP?
- Is PHP notice an error?
- How do I show PHP errors on the same page?
Why is this?
How can I configure PHP to display errors?
asked Apr 15, 2011 18:25
To turn on errors
the script level, include the top of your script:
ini_set(‘display_errors’, 1);
error_reporting(~0);
Alternatively, if it is not a production site and simply a development / testing site, you can turn on error reporting in php.ini. Search it for these settings:
error_reporting = E_ALL
;error_reporting = E_ERROR
display_errors = On
;display_errors = Off
1
May be the display error is off
add in .htaccess file of your application.
php_value display_errors on
OR
use this the top of your php script
ini_set(‘display_errors’,”1″);
answered Apr 15, 2011 18:26
Shakti SinghShakti Singh
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To show error message on page over browser for php script use following code in top of your php file.
<?php
ini_set(‘display_errors’, 1);
error_reporting(~0);
?>
and there is another way to check php
error code if you are linux ubuntu user execute following command on terminal.
NOTE : -10 is the number of message you want to show.
answered Sep 3, 2015 10:23
Sunny S.MSunny S.M
5,4581 gold badge37 silver badges38 bronze badges
It possibly did override your settings in the php.ini. Check the php.ini for error handling parameters and make sure they’re switched on.
Happened to me a few weeks ago, too
answered
Apr 15, 2011 18:26
BjoernBjoern
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You can use following code in your program
error_reporting(E_ALL);
ini_set(‘display_errors’, ‘1’);
answered Feb 17, 2015 8:27
Ram ChoubeyRam Choubey
2652 silver badges12 bronze badges
A PHP application might produce many different levels of earning and errors during its execution. Being able to see these errors is essential for developers trying to troubleshoot a misbehaving application. However, developers often have trouble when trying to display errors from their PHP applications. Instead, their apps just fail silently.
If
you are having problems with your PHP web application and need to display all the errors and warnings, you are in the right place. In this tutorial, we will explain all the different ways to enable PHP errors and warnings. We will also discuss how to write the errors to a log file and even collect them via the Retrace’s error tracking feature.
Quickly
Show All PHP Errors
The quickest way to display all php errors and warnings is to add these lines to your PHP code file:
ini_set(‘display_errors’, 1);
ini_set(‘display_startup_errors’, 1);
error_reporting(E_ALL);What Do These Lines of Code Do Exactly?
The ini_set function will try to override the configuration found in your PHP ini file.
The display_errors and display_startup_errors are just two of the directives that are available. The display_errors directive will determine if the errors will be displayed or
hidden to the user. Usually, the dispay_errors directive should be turned off after development.
The display_startup_errors, however, is a separate directive because the display_errors doesn’t handle the errors that will be encountered during PHP’s startup sequence. The list of the directives that can be overridden by the ini_set function is found in the official documentation.
Unfortunately,
these two directives won’t be able to display parse errors such as missing semicolons or missing curly braces. In this case, the PHP ini configuration must be modified.
Configure PHP.ini to Display All Errors
If adding some of the PHP code errors doesn’t show in the browser during testing, then the PHP ini configuration has some additional directives to handle this.
display_errors = on
The display_errors directive must be set to “on”
in the PHP ini file. This will display all the errors including syntax or parse errors that cannot be displayed by just calling the ini_set function in the PHP code. The PHP ini file can be found in the displayed output of phpinfo() function and is labeled loaded configuration file. This directive in the ini configuration must be set to off, if the web application is in production.
Display PHP Errors via .htaccess Configuration
Developers
usually have access to the directory files. The directive for showing PHP errors can also be enabled or disabled using the .htaccess file located in the root or public directory of the project.
php_flag display_startup_errors on
php_flag display_errors on
Similar to what will be added to the PHP code to show PHP errors, .htaccess also has directives for display_startup_errors and display_errors. The advantage of showing or disabling error messages in this manner is that development and production can have different .htaccess files, where the
production suppresses the displaying of errors.
Depending on which files you have access to and how you do deployments and server configurations, you may want to configure display_errors in .htaccess or your PHP.ini file. Many hosting providers will not allow you to modify your PHP.ini file to enable display_errors.
In the .htaccess file, a custom error log can also be enabled as long as the log thư mục or the log file is writable by the web server. The log file can be a relative path
to where the .htaccess is located, or it can be an absolute path such as /var/www/html/website/public/logs.
php_value error_log logs/all_errors.log
Enable Detailed Warnings and Notices
Sometimes, the warnings that seem not to affect the application the start will cause some fatal errors in certain conditions. These warnings must be fixed because this means that the application won’t run normally under certain scenarios. In case these warnings cause a lot of errors, then it
would be more practical to hide the errors and just show what the warning messages are.
error_reporting(E_WARNING);
For a developer, showing warnings and hiding errors is just as simple as adding a single line of code. To show warnings and notices, the parameter for the error reporting function will be “E_WARNING | E_NOTICE”. The error_reporting function can accept E_ERROR, E_WARNING, E_PARSE, and E_NOTICE parameters as bitwise operators. To report all errors except for notices, then the parameter is “E_ALL
& ~E_NOTICE” where E_ALL stands for all the possible parameters of the error_reporting function.
In-depth With the error_reporting() function
The error reporting function is a built-in PHP function that allows developers to control which and how many errors will be shown in the application. Remember, the PHP ini configuration has an error_reporting directive that will be set by this function during runtime.
error_reporting(0);
To remove all errors,
warnings, parse messages, and notices, the parameter that should be passed to the error_reporting function is zero. It would be not practical to have this line of code in each of the PHP files. It would be better to turn off report messages in the PHP ini file or in the .htaccess.
error_reporting(E_NOTICE);
PHP allows variables to be used even when not declared. This is not a standard practice because undeclared variables will cause issues for the application once it is used in loops and conditions.
Sometimes, this also happens because the declared variable has a different spelling than the variable being used for conditions or loops. When E_NOTICE is passed in the error_reporting function, then these undeclared variables will be displayed in the web application.
error_reporting(E_ALL & ~E_NOTICE);
The error reporting function allows you to filter which errors can be shown. The “~” character means “not” or “no” so the parameter ~E_NOTICE means not to show notices. Notice the “&” and “|” characters in between
the possible parameters. The “&” character is for “true for all”, while the “|” character represents either one as long as it is true. These two characters have the same meaning in PHP conditions OR and AND.
error_reporting(E_ALL);
error_reporting(-1);
ini_set(‘error_reporting’, E_ALL);
These three lines of codes do exactly the same thing, it will show all PHP errors. The error_reporting(E_ALL) is the most widely used among developers to show error messages because it is more readable and understandable.
Log PHP
errors to a file using the error_log() function
During production, error messages must not be shown to the end users, but this information must still be recorded for tracing purposes. The best way to record these error messages on a production web application is to store it in log files.
One easy way to use log files is to use the error_log function, which accepts four parameters. The only required parameter is the first parameter, which contains the details about the error or
what’s to be logged. The type, destination, and header are all optional parameters for this function.
error_log(“There is something wrong!”, 0);
The type parameter, if not defined, will be 0 by default, which means this log information will be appended to whatever log file is defined in the web server.
error_log(“E-Mail this error to someone!”, 1, “[email protected]”);
The type 1 parameter will email an error log specified in the third parameter. To make this feature work, the PHP ini must have a proper SMTP configuration to be able to send out emails. These SMTP ini directives
include host, encryption type, username, password, and port. This kind of error reporting is advisable to logging or notifying errors that need to be fixed as soon as found.
error_log(“Write this error down to a file!”, 3, “logs/my-errors.log”);
To log messages in a separate file defined by the configuration of the web server, then type 3 must be used. The third parameter will serve as the location of the log file and must be writable by the web server. The location of the log file can be a relative path to where this code is called or an absolute
path.
Log PHP Errors Through the Web Server Configuration
To avoid changing parameters in the .htaccess or adding some lines in the PHP code to show errors, then the best way to log errors is defining it in the web server configuration file.
ErrorLog “/var/log/apache2/my-website-error.log”
For Apache, these files must be added to the virtual host of the specific website or application, usually located inside the sites-available thư mục for Ubuntu or httpd-vhosts file in Windows.
error_log /var/log/nginx/my-website-error.log;
For nginx, similar to Apache, the directive is just called error_log. For both Apache and nginx web servers, the log files must be writable by the web server. Luckily, upon installation, the folders for the log files of these two web servers are already writable.
Automatically Collect PHP Errors With Retrace APM
Retrace is an APM (Application Performance Management) tool
offered by Stackify. But the tool goes beyond monitoring the performance of your application. It allows you to do centralize logging, perform code profiling, and stay on top of server and application metrics.
One of the great
features of Retrace is its ability to automatically collect all unhandled errors in your PHP application. Our PHP extension will catch the exception and forward them automatically to Retrace.
With Retrace, all the errors are automatically logged and formatted so that it can be viewed easily. Retrace will not only show what errors have
occurred but also analyzes where and what caused it. The time and number of occurrences are also shown in the logs so that it would be a lot easier to focus on which issue to prioritize.
To learn more about Retrace, please check out the Retrace feature page on error tracking. Also, try Stackify’s không lấy phí code
profiler, Prefix, to write better code on your workstation. Prefix works with .NET, Java, PHP, Node.js, Ruby, and Python.
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How do I find PHP errors?
Look for the entry Configuration File (php.
Find the Error handling and logging section of the php. ini file. Make sure that both display_errors = On, display_startup_errors = On and log_errors = On are present and uncommented. Check the value of error_log – this tells you the location of the file errors are logged to.
Can we hide errors in PHP?
To turn off or disable error reporting in PHP, set the value to zero. For example, use the code snippet: <?
Is PHP notice an error?
Notice Error
Notice errors are minor errors. They are similar to warning errors, as they also don’t stop code execution. Often, the system is uncertain whether it’s an actual error or regular code.
How do I show PHP errors on the same page?
= ‘Please enter your home page. <br/>’; } if ($_POST[‘message’] != “”) { $_POST[‘message’] = filter_var($_POST[‘message’], FILTER_SANITIZE_STRING); if ($_POST[‘message’] == “”) { $errors . = ‘Please enter a message to send.
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