Online PHP editor | output for Qqv8Q

<?php class system_tags { function __call($name, $params) { return 'TAG ' . $name; } } class App { function run() { // Prerequisites. $system_tags = new system_tags(); $code = new \stdClass(); $code->tags = [ 'hello' => 'HELLO', 'world' => 'WORLD', ]; $this->template = 'Blah blah {hello} blah blah {world}.'; $this->withStrReplace($code, $system_tags); $this->template = 'Blah blah {hello} blah blah {world}.'; $this->withRegexReplaceCallback($code, $system_tags); } function withStrReplace($code, $system_tags) { foreach($core->tags as $tag_name => $tag_method) { $this->template = str_replace( '{' . $tag_name . '}', $system_tags->{$tag_method}(), $this->template ); } } function withRegexReplaceCallback($code, $system_tags) { $callback = static function ($matches) use (& $tag_method, $system_tags) { return $system_tags->{$tag_method}(); }; foreach($core->tags as $tag_name => $tag_method) { $this->template = preg_replace_callback( '/\{' . preg_quote($tag_name) . '\}/', $callback, $this->template ); } echo $this->template . "\n<br>"; } }