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<?php
  if(isset($_POST))// Ö»ÓÐ $_POST ±äÁ¿´æÔÚ£¬²Å´¦Àí.
{
echo $_POST['tel'].' <p>';

}

echo preg_replace("/hi/i","zuoyefeng","HI ,china php")." <br>";
echo preg_replace("/ /i","****","$_POST[tel]");

?>
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$hidden_phone=$_POST['tel'];
$hidden_phone[2]="*";
$hidden_phone[3]="*";
$hidden_phone[4]="*";
$hidden_phone[5]="*";
$hidden_phone[6]="*";
$hidden_phone[8]="*";
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<?
echo preg_replace("/(? <=\d{2})\d{5}/i","*****","12345678963")." <br>";
?>

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<?
echo preg_replace("/(? <=\d{2})\d{6}/i","******","12345678963")." <br>";
?>

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