PHP replace only working once -

i have string containing html coming form ($postcontent). want assign unique id every image.

i have following code:

$numimages=substr_count($postcontent, '<img'); for($o=0; $o<$numimages; $o++){   $pos = strpos($postcontent,"<img");   $postcontent = substr_replace($postcontent,"<img id='$o' height='50px' onclick='resize(\"$o\")' ",$pos,4); } 

it works fine first occurence of tag, rest not work.

further explaination:

<div><img src="http://image1"><img src="image2"></div> 

after going trough code gives this:

<div> <img id='1' height='50px' onclick='resize("1")'  id='0' height='50px' onclick='resize("0")'  src="http://image1"><img src="http://image2"></div> 

anyone has idea problem might be?

your call strpos finding first instance of <img. need use third argument offset position of previous <img, plus one. see manual entry strpos.

so me code worked:

$postcontent = '<div><img src="http://image1"><img src="image2"><img src="image3"></div>'; $numimages=substr_count($postcontent, '<img'); $last_pos = 0; for($o=0; $o<$numimages; $o++){   $pos = strpos($postcontent,"<img",$last_pos+1);   $postcontent = substr_replace($postcontent,"<img id='$o' height='50px' onclick='resize(\"$o\")' ",$pos,4);   $last_pos = $pos; } echo htmlentities($postcontent); 

which produces output:

<div><img id='0' height='50px' onclick='resize("0")' src="http://image1"><img id='1' height='50px' onclick='resize("1")' src="image2"><img id='2' height='50px' onclick='resize("2")' src="image3"></div>