wp_cache_check_global_config() │ WPSCache 1.0

No Hooks.

Returns

null. Nothing (null).

Usage

wp_cache_check_global_config();

wp_cache_check_global_config() code WPSCache 2.0.1

wp-super-cache/wp-cache.php 
<?php
function wp_cache_check_global_config() {
	global $wp_cache_check_wp_config;

	if ( !isset( $wp_cache_check_wp_config ) )
		return true;


	if ( file_exists( ABSPATH . 'wp-config.php') ) {
		$global_config_file = ABSPATH . 'wp-config.php';
	} else {
		$global_config_file = dirname( ABSPATH ) . '/wp-config.php';
	}

	if ( preg_match( '#^\s*(define\s*\(\s*[\'"]WP_CACHE[\'"]|const\s+WP_CACHE\s*=)#m', file_get_contents( $global_config_file ) ) === 1 ) { // phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
		if ( defined( 'WP_CACHE' ) && ! constant( 'WP_CACHE' ) ) {
			?>
			<div class="notice notice-error"><h4><?php esc_html_e( 'WP_CACHE constant set to false', 'wp-super-cache' ); ?></h4>
			<p><?php esc_html_e( 'The WP_CACHE constant is used by WordPress to load the code that serves cached pages. Unfortunately, it is set to false. Please edit your wp-config.php and add or edit the following line above the final require_once command:', 'wp-super-cache' ); ?></p>
			<p><code>define('WP_CACHE', true);</code></p></div>
			<?php
			return false;
		} else {
			return true;
		}
	}

	$line = 'define(\'WP_CACHE\', true);';
	if (
		! is_writeable_ACLSafe( $global_config_file ) ||
		! wp_cache_replace_line( 'define *\( *\'WP_CACHE\'', $line, $global_config_file )
	) {
		if ( defined( 'WP_CACHE' ) && constant( 'WP_CACHE' ) == false ) {
			echo '<div class="notice notice-error">' . __( "<h4>WP_CACHE constant set to false</h4><p>The WP_CACHE constant is used by WordPress to load the code that serves cached pages. Unfortunately, it is set to false. Please edit your wp-config.php and add or edit the following line above the final require_once command:<br /><br /><code>define('WP_CACHE', true);</code></p>", 'wp-super-cache' ) . "</div>";
		} else {
			echo '<div class="notice notice-error"><p>' . __( "<strong>Error: WP_CACHE is not enabled</strong> in your <code>wp-config.php</code> file and I couldn&#8217;t modify it.", 'wp-super-cache' ) . "</p>";
			echo "<p>" . sprintf( __( "Edit <code>%s</code> and add the following line:<br /> <code>define('WP_CACHE', true);</code><br />Otherwise, <strong>WP-Cache will not be executed</strong> by WordPress core. ", 'wp-super-cache' ), $global_config_file ) . "</p></div>";
		}
		return false;
	}  else {
		echo "<div class='notice notice-warning'>" . __( '<h4>WP_CACHE constant added to wp-config.php</h4><p>If you continue to see this warning message please see point 5 of the <a href="https://wordpress.org/plugins/wp-super-cache/faq/">Troubleshooting Guide</a>. The WP_CACHE line must be moved up.', 'wp-super-cache' ) . "</p></div>";
	}
	return true;
}