PHP Save array to file

gistfile1.txt

<?php 
$data=array( 
  "name"=>"beckham", 
  "address"=>"LA" 
); 

$filename = 'data.txt'; 
$string   = ''; 

foreach($data as $key => $val) { 
    $string .= "$key = $val\n"; 
} 

file_put_contents($filename, $string); 
?>