Why Is My PHP Script Hitting the "Allowed Memory Size" Error Even When PHPInfo Shows Enough Memory?

Understanding the "Allowed Memory Size of X Bytes Exhausted" Error

The infamous "Allowed memory size of X bytes exhausted" error in PHP often leaves developers perplexed, especially when PHPInfo indicates a seemingly adequate memory limit. To unravel this mystery, let's delve into the possible causes.

Multiple PHP Configurations

PHP's memory limit can be configured in various locations:

• Master system php.ini
• Apache's configuration
• CLI/CGI's php.ini
• .htaccess files
• Code using ini_set()

PHPInfo's Output

PHPInfo displays two values for memory_limit: "Master" and "Local." The "Master" value represents the default compiled-in limit, while the "Local" value reflects the actual effective limit. If the "Local" value differs from the "Master" value, modifications have been made in one of the configuration locations mentioned above.

CLI vs. Webserver

PHP typically uses separate .ini files for command-line (CLI) and webserver-based operation. Checking PHPInfo from the CLI will yield different memory limit values than checking it in a web-based script.

Troubleshooting

To diagnose the "Allowed memory size" error, consider the following troubleshooting steps:

• Check the PHPInfo "Local" value for memory_limit to identify the actual effective limit.
• Review the Apache configuration files and .htaccess files to find any memory_limit overrides.
• If the memory limit was modified via ini_set() in the code, remove the call or adjust the memory_limit parameter.
• Ensure that the command-line and webserver operation use the correct .ini files and memory limit configurations.

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