How to log errors and warnings into a file in php?
In PHP, errors and warnings can be logged into a file by using a php script and changing configuration of php.ini file. Two such approaches are mentioned below:
Approach 1: The error_log() function can be used to send error messages to a given file. First argument to the function is the error message to be sent. Second argument tells where to send/log the error message. In this case, second argument is set to 3, used to redirect error message to a file. Third argument is used to specify the file path of the error logging file.
Below is the implementation of the above approach:
<?php
$error_message = "This is an error message!" ;
$log_file = "./my-errors.log" ;
error_log ( $error_message , 3, $log_file );
?>
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Output:
[20-Dec-2018 17:32:00 UTC] This is an error message!
Approach 2:
- The init_set() function allows a user to programmatically update configuration of the php.ini file.
- The ini_set(“log_errors”, TRUE) command can be added to the php script to enable error logging in php.
- The ini_set(‘error_log’, $log_file) command can be added to the php script to set the error logging file.
- Further error_log($error_message) function call can be used to log error message to the given file.
Below is the implementation of the above approach:
<?php
$error_message = "This is an error message!" ;
$log_file = "./my-errors.log" ;
ini_set ( "log_errors" , TRUE);
ini_set ( 'error_log' , $log_file );
error_log ( $error_message );
?>
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Output:
[20-Dec-2018 17:30:35 UTC] This is an error message!
Similar Approach: Following lines can also be added directly to php.ini to make the configuration changes permanent for every php script that logs errors and warnings.
log_errors = on
error_log = ./errors.log
Note:: This approach is not highly reliable as compared to other approaches. Its better to use approach 1 as it gives flexibility of choosing different files for logging at same time without changing configuration of php.ini file.
Last Updated :
02 Jan, 2019
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