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How to Remove Characters Except Numbers from a String ?

Following Code will remove all character,special characters including space.   $givenNumber = "1245fdfd8454D FDFDF434 3$#$#%";   $testingNumber = preg_replace('[D]’, ”, $givenNumber);   echo $testingNumber;   Output is : 124584544343 $givenNumber = "1245fdfd8454D FDFDF434 3$#$#%"; $testingNumber = preg_replace(‘[D]’, ”, $givenNumber); echo $testingNumber; Output is : 124584544343