Why is max_input_vars Limiting My PHP 5.1.6 Application?

PHP max_input_vars Directive and Version Compatibility

Despite running PHP version 5.1.6, you encountered a max_input_vars error message and discovered a value of 1000 for this setting in your phpinfo() configuration. Given that max_input_vars was introduced with version 5.3.9, you question if the value is hard-coded in this older version.

Answer:

According to the PHP documentation, the max_input_vars directive was indeed introduced in version 5.3.9. However, the documentation also notes that prior to version 5.3.9, this setting was hard-coded and could not be modified in php.ini or runtime.

Therefore, it is not possible to change the max_input_vars value in PHP version 5.1.6. To resolve the error, you will need to either upgrade to a PHP version that supports changing this directive or find alternative ways to reduce the number of variables being processed.

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