PHP - str_replace example

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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

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