<?php$str = ",a,b,c,,,d,,"echo $str=str_replace(',,','',$str);?>Output:,a,b,c,d
<?php $str = ",a,b,c,,,d,,"echo $str=trim(str_replace(',,','',$str),',');?>Output:a,b,c,d
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Answer by Subrata Mallik for How to remove unwanted commas from a string?
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