PHP - str_replace example

Syntax
    
        str_replace($find, $replace, $string, $count)
    
Example 1
    
        $string = 'Hello world!';
        $find = 'world!';
        $replace = 'foo bar!';
        $result = str_replace($find, $replace, $string);
        echo $result;
        // output
        // Hello foo bar
    
Example 2
    
        $string = 'Hello world!';
        $find = 'o';
        $replace = '';
        $result = str_replace($find, $replace, $string, $count);
        print_r($count);
        // output
        // 2