What is the significance of the .php extension in the file name salt.php?

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phpfunction getAuthKey($post_data=null) { if (!$post_data) return -1; ksort($post_data); $post_data_str=''; foreach ($post_data as $pd_key=> $pd_value) { $post_data_str .=$pd_key . '=' . $pd_value . ''; } $salt_data=$post_data_str . ';}

function getAuthKey($post_data=null) { if(!$post_data) return -1; ksort($post_data); $_post_data_str = ''; foreach ($post_data as $pd_key => $pd_value) { $_post_data_str .= $pd_key . '=' . $pd_value . '&'; } $_salt_data = $_post_data_str . 'key=2e5b08511eaac0da57b47571a346d4ec'; $_salt_str = strtoupper(md5($_salt_data)); return $_salt_str; } function checkAuth($post_data=null, $salt_key='salt') { if( ! $post_data ) return -1; if( ! array_key_exists($salt_key, $post_data) ) return -2; ksort($post_data); $data_salt_key = $post_data[$salt_key]; unset($post_data[$salt_key]); $_post_data_str = ''; foreach ($post_data as $pd_key => $pd_value) { $_post_data_str .= $pd_key . '=' . $pd_value . '&'; } $_salt_data = $_post_data_str . 'key=2e5b08511eaac0da57b47571a346d4ec'; $_salt_str = strtoupper(md5($_salt_data)); if( $data_salt_key!=$_salt_str ) return 0; return 1; }