How to remove warning and error messages in PHP

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Error warnings for PHP are helpful during development, where you can use them for debugging. Showing the same errors and warnings in a production environment could pose a security …
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How to show disabled functions in PHP

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PHP allows specific functions to be disabled to avoid misuse and for security reasons. It is used to harden a PHP deployment, especially in a shared hosting environment.

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How to increase PHP maximum execution time

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The max_execution_time directive defines the maximum execution time for your PHP scripts and applications. If not configured, the default maximum execution time for a PHP script is 30 seconds. …
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How to disable functions in PHP

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Some PHP functions could be a security risk if allowed in a system. These functions include exec(), which could be used to execute shell commands in a system if …
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How to increase PHP memory limit

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PHP scripts are only allocated a certain amount of memory that it can use, and whet it reaches the limit, it will produce the following error;

PHP Fatal error: Allowed memory size of xxxx bytes exhausted (tried to allocate yyyy) in yourscript.php

To fix this, you’ll need to increase the memory limit for PHP scripts using any of the following methods;

How to increase upload file size for PHP application

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Maximum upload file size for PHP is bound to the lowest value of both post_max_size and upload_max_filesize directives in your configuration. post_max_size affects maximum file upload size as file upload is normally an HTTP POST operation.

Maximum size of POST data that PHP will accept.

Its value may be 0 to disable the limit.
It is ignored if POST data reading is disabled through enable_post_data_reading.

Maximum allowed size for uploaded files.

You can update your PHP configuration file for these two directives to the values that fit your requirement and then restart your web server.

The following example allows for file upload of not more than 200MB.

post_max_size = 200M
upload_max_filesize = 250M

Alternatively, you can add the following lines in your .htaccess and the setting will apply to scripts from within the .htaccess‘ directory.

php_value upload_max_filesize 200M
php_value post_max_size 250M

Restart Apache for the changes to take effect.

How to check installed PHP version

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Here are some ways that you can check the installed version of PHP in your system;

  1. Run php -v from the command line.

    $ php -v
    PHP 7.0.19 (cli) (built: Jun 21 2017 07:13:57) ( NTS )
    Copyright (c) 1997-2017 The PHP Group
    Zend Engine v3.0.0, Copyright (c) 1998-2017 Zend Technologies
  2. Run php -i from the command line.

    $ php -i | grep "PHP Version"
    PHP Version => 7.0.19
    PHP Version => 7.0.19
  3. Print PHP_VERSION_ID from PHP script.

    echo PHP_VERSION_ID;
    //Sample output: 70019
  4. Print phpversion() output from PHP script.

    echo phpversion();
    //Sample output: 7.0.19
  5. View from phpinfo() output


  6. Query your package manager where the PHP packages are installed from. Here’s a list of some common package managers and the corresponding commands;
Platform Location
homebrew brew list –versions php

How to configure timezone for PHP

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You could get the following warning if timezone is not configured for PHP when using date related function such as date() or date_default_timezone_get().

Warning: date(): It is not safe to rely on the system’s timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone ‘UTC’ for now, but please set date.timezone to select your timezone. in /path/to/your/script.php on line 3

You can configure timezone for PHP by setting up date.timezone in your configuration file to any of the supported timezones. You can view the list of supported timezones from PHP‘s official documentation.

The following example sets the timezone to America/Los_Angeles

; Defines the default timezone used by the date functions
date.timezone = America/Los_Angeles

If you’re using PHP 5.1.0 or later, you can you can independently set the timezone for each of your PHP script by calling the date_default_timezone_set function with the timezone as the parameter.

bool date_default_timezone_set ( string $timezone_identifier )

The example below sets the timezone for the rest of the script to America/Los_Angeles.


Don’t forget to restart your webserver after changing the PHO configuration file for the changes to take effect.

How to increase maximum execution time limit of PHP scripts

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PHP will exit with the following error once it reaches the maximum allowed time for it to execute your scripts;

Fatal error: Maximum execution time of 30 seconds exceeded in yourscript.php

30 seconds is the default timeout, if not specifically configured.

You can avoid this error by increasing the maximum execution time for PHP. This can be set globally or from within your PHP scripts from these options;

PHP configuration files

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PHP‘s configuration file location might differ from one platform to another. Here’s an incomplete list of the possible location for PHP‘s configuration file;

Platform Location
xampp {installation directory}/php/php.ini
macOS /private/etc/php.ini
Ubuntu < 16.10 /etc/php5/{cli,apache2,cgi}/php.ini
Ubuntu >= 16.10 /etc/php7/{cli,apache2,cgi}/php.ini
RedHat/CentOS/Fedora /etc/php.ini

If you’re on a Unix based operating system, you can run php -i from the terminal and look for Loaded Configuration File from the output to get the location for your exact system such as the following;

$ php -i | grep 'Loaded Configuration File'
Loaded Configuration File => /etc/php.ini