If you use single quotation marks to enclose the same string, the variable is not substituted: : Quotation « String « PHP

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PHP » String » Quotation 
If you use single quotation marks to enclose the same string, the variable is not substituted:
 
<?
print 'hello, $name'; // hello, $name
?>

Double-quoted strings are also parsed for escape characters.
  
  
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