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´ó¼ÒºÃ £º
  ÎÒÓÃfck±à¼­Æ÷Éú²úÒ»¶Îhtml´úÂëÈ磺
  ×ð¾´µÄ{{email}}ÄúºÃ£¡
  Thank you for visiting 51customimprint, We have successful change your password .
  Õâ¸öÊǸö×Ö·û´® ÎÒÏÖÔÚÏ뽫ÀïÃæµÄ{{email}}Ìæ»»³É{$email}
  µ«ÊÇÌæ»»³É¹¦Ö®ºó×ÜÊÇÊä³ö
  ×ð¾´µÄ{$email}ÄúºÃ£¡
  Thank you for visiting 51customimprint, We have successful change your password .
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ÓÑÇéÖ§³Ö~up~up~up~!

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²»ÊÇÌæ»»Ãæ {$email}

ÊÇ $mail Õâ¸öÖµÌæ»» {email} Õâ¸ö¶«Î÷

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{<? echo $email ?>}

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PHP code:
<?php
$email='youname@domain.com';
$username='yourname';

$str = '×ð¾´µÄ{{username}}ÄúºÃ£¡Thank you for visiting 51customimprint, We have successful changed your password and sent to {{email}}.';

//這樣Ò²ÐÐ,¸üÈÝÒ×Àí½â
$reg_str = preg_replace("/\{\{(.+?)\}\}/e","\$\$1",$str);
echo $reg_str;
?>

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´ÓÉÏÀý
$reg_str = preg_replace("/\{{2}(\w+)\}{2}/e","$$1",$str);