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$result = str_replace($str, "", 'He$llo Wor$ld of PHP');
echo $result;


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$result = str_replace($str, "", 'He$llo Wor$ld of PHP');
echo $result; //Hello World of PHP

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str_replace('\$', "", $str); //$joao#$$$

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$str = '$chenxuezhi1986$$$';
echo preg_replace('/\$/', "", $str, 1); //chenxuezhi1986$$$

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