General: Check that `set_time_limit()` function is available before using it in core.

This avoids a fatal error if the function is disabled on certain environments.

Props theode, jokerrs, johnbillion, hellofromTonya, costdev, jrf, azaozz, SergeyBiryukov.
Fixes #55711.
Built from https://develop.svn.wordpress.org/trunk@55258


git-svn-id: http://core.svn.wordpress.org/trunk@54791 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/ajax-actions.php

@@ -3528,7 +3528,10 @@ function wp_ajax_get_revision_diffs() {
 	}
 
 	$return = array();
+
+	if ( function_exists( 'set_time_limit' ) ) {
 		set_time_limit( 0 );
+	}
 
 	foreach ( $_REQUEST['compare'] as $compare_key ) {
 		list( $compare_from, $compare_to ) = explode( ':', $compare_key ); // from:to

wp-admin/includes/class-wp-upgrader.php

@@ -471,7 +471,9 @@ class WP_Upgrader {
 		$destination       = $args['destination'];
 		$clear_destination = $args['clear_destination'];
 
+		if ( function_exists( 'set_time_limit' ) ) {
 			set_time_limit( 300 );
+		}
 
 		if ( empty( $source ) || empty( $destination ) ) {
 			return new WP_Error( 'bad_request', $this->strings['bad_request'] );

wp-admin/includes/file.php

@@ -540,7 +540,9 @@ function wp_edit_theme_plugin_file( $args ) {
 		}
 
 		// Make sure PHP process doesn't die before loopback requests complete.
+		if ( function_exists( 'set_time_limit' ) ) {
 			set_time_limit( 5 * MINUTE_IN_SECONDS );
+		}
 
 		// Time to wait for loopback requests to finish.
 		$timeout = 100; // 100 seconds.

wp-admin/includes/update-core.php

@@ -1053,7 +1053,9 @@ $_new_bundled_files = array(
 function update_core( $from, $to ) {
 	global $wp_filesystem, $_old_files, $_old_requests_files, $_new_bundled_files, $wpdb;
 
+	if ( function_exists( 'set_time_limit' ) ) {
 		set_time_limit( 300 );
+	}
 
 	/*
 	 * Merge the old Requests files and directories into the `$_old_files`.

wp-includes/comment.php

@@ -3111,7 +3111,10 @@ function pingback( $content, $post ) {
 		$pingback_server_url = discover_pingback_server_uri( $pagelinkedto );
 
 		if ( $pingback_server_url ) {
+			if ( function_exists( 'set_time_limit' ) ) {
 				set_time_limit( 60 );
+			}
+
 			// Now, the RPC call.
 			$pagelinkedfrom = get_permalink( $post );
 

wp-includes/deprecated.php

@@ -3659,7 +3659,9 @@ function post_permalink( $post = 0 ) {
 function wp_get_http( $url, $file_path = false, $red = 1 ) {
 	_deprecated_function( __FUNCTION__, '4.4.0', 'WP_Http' );
 
+	if ( function_exists( 'set_time_limit' ) ) {
 		@set_time_limit( 60 );
+	}
 
 	if ( $red > 5 )
 		return false;

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.2-alpha-55257';
+$wp_version = '6.2-alpha-55258';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.