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<?php |
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/** |
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* The WP_CACHE define, and how to strip it out of wp-config.php. |
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* |
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* Deliberately a plain function in its own file rather than a method on |
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* Cache: `uninstall.php` runs standalone — WordPress loads it without |
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* bootstrapping the plugin, so no class of ours exists there. Keeping the |
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* pattern in one requirable file is what stops the two call sites drifting. |
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* They already had, which is the bug this fixes: the removal regex was |
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* copy-pasted, and hardening one copy would have left the other broken. |
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* |
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* @package XSpeed |
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*/ |
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|
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defined( 'ABSPATH' ) || exit; |
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|
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if ( ! function_exists( 'xspeed_strip_wp_cache_define' ) ) { |
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/** |
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* Remove every `define( 'WP_CACHE', … );` statement from wp-config source. |
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* |
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* The old pattern hardcoded a lowercase `true` with no `/i`, so |
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* `TRUE`, `True`, `1`, `'1'` and `"1"` never matched — disabling the |
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* cache (or uninstalling) silently left the constant behind. Those |
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* spellings are common: several hosts' one-click stacks and older |
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* tutorials write `TRUE` or `1`, and any plugin that previously owned |
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* the constant may have written it in its own style. The orphan then |
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* confuses the next caching plugin the site installs — W3 Total Cache |
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* and WP Rocket both branch on it — and makes a "clean uninstall" not |
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* clean. (#9) |
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* |
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* Matches the VALUE as `[^)]*`, the same shape the enable branch in |
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* Cache::set_wp_cache_constant() already uses, so any spelling goes: |
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* true / TRUE / 1 / '1' / false / 0, with or without inner spaces. |
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* `false` is removed too — leaving `define( 'WP_CACHE', false );` |
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* behind is the same orphan problem, just quieter. |
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* |
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* Only our own statement shape is targeted. A commented-out line keeps |
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* its `#`/`//` prefix and is left alone by the leading-boundary match; |
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* a define built dynamically (concatenation, a variable) is not a |
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* literal statement and is out of scope for a regex — those are |
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* vanishingly rare in wp-config.php and unsafe to rewrite blind. |
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* |
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* @param string $config Raw wp-config.php contents. |
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* @return string Contents with the define(s) removed. |
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*/ |
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function xspeed_strip_wp_cache_define( $config ) { |
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if ( ! is_string( $config ) || '' === $config ) { |
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return $config; |
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} |
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|
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$stripped = preg_replace( |
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'/^[ \t]*define\(\s*[\'"]WP_CACHE[\'"]\s*,\s*[^)]*\)\s*;[ \t]*\r?\n?/mi', |
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'', |
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$config |
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); |
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|
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// preg_replace() returns null on failure (catastrophic backtracking, |
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// bad UTF-8). Returning that would blank wp-config.php — hand back |
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// the untouched source instead and leave the constant in place. |
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return is_string( $stripped ) ? $stripped : $config; |
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} |
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} |
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|
