Avoid PHP-4 comparison functions

Author: schlessera

src/Option_Command.php

@@ -423,7 +423,7 @@ public function update( $args, $assoc_args ) {
 		}
 		$old_value = sanitize_option( $key, get_option( $key ) );
 
-		if ( $value === $old_value && is_null( $autoload ) ) {
+		if ( $value === $old_value && null === $autoload ) {
 			WP_CLI::success( "Value passed for '{$key}' option is unchanged." );
 		} else {
 			if ( update_option( $key, $value, $autoload ) ) {

src/Term_Command.php

@@ -358,7 +358,7 @@ public function update( $args, $assoc_args ) {
 		$assoc_args = wp_parse_args( $assoc_args, $defaults );
 
 		foreach ( $assoc_args as $key => $value ) {
-			if ( is_null( $value ) ) {
+			if ( null === $value ) {
 				unset( $assoc_args[ $key ] );
 			}
 		}

src/User_Command.php

@@ -963,7 +963,7 @@ public function import_csv( $args, $assoc_args ) {
 				$roles        = array_map( 'trim', explode( ',', $new_user['roles'] ) );
 				$invalid_role = false;
 				foreach ( $roles as $role ) {
-					if ( is_null( get_role( $role ) ) ) {
+					if ( null === get_role( $role ) ) {
 						WP_CLI::warning( "{$new_user['user_login']} has an invalid role." );
 						$invalid_role = true;
 						break;
@@ -976,7 +976,7 @@ public function import_csv( $args, $assoc_args ) {
 				$secondary_roles  = $roles;
 			} elseif ( 'none' === $new_user['role'] ) {
 				$new_user['role'] = false;
-			} elseif ( is_null( get_role( $new_user['role'] ) ) ) {
+			} elseif ( null === get_role( $new_user['role'] ) ) {
 				WP_CLI::warning( "{$new_user['user_login']} has an invalid role." );
 				continue;
 			}
@@ -1105,7 +1105,7 @@ public function reset_password( $args, $assoc_args ) {
 	 */
 	private static function validate_role( $role ) {
 
-		if ( ! empty( $role ) && is_null( get_role( $role ) ) ) {
+		if ( ! empty( $role ) && null === get_role( $role ) ) {
 			WP_CLI::error( sprintf( "Role doesn't exist: %s", $role ) );
 		}
 

src/WP_CLI/Fetchers/Comment.php

@@ -22,7 +22,7 @@ public function get( $arg ) {
 		$comment_id = (int) $arg;
 		$comment    = get_comment( $comment_id );
 
-		if ( is_null( $comment ) ) {
+		if ( null === $comment ) {
 			return false;
 		}