Memory exhausted

Posted on 2005-05-13
Medium Priority
Last Modified: 2011-09-20
Linux & HTTPD.
I'm testing the script below on a file of 4660 bytes and I'm getting the following HTTPD message:
Allowed memory size of 8388608 bytes exhausted (tried to allocate 3 bytes)

All I know is that the script reads the file and displays the length $fylel as 4660 bytes.

 for ($i=0; $i < $fylel; $i++) {#1
 if (substr($fyle,$i,1) != "&") {#2
  $outp .= (substr('$fyle',$i,1));
   else {#3
   for ($j=$i; $j < $fylel; $j+6) {#4
    if (substr($fyle,$j,6) == "&nbsp;") {#5
    $outp .= "[" . chr($cont) . "]";

There must be something in the code creating this situation, what is it?
Is it acceptable to change the value of $i = $j as above?
Any other hint most welcome.
Question by:rblampain

Expert Comment

ID: 13997957
Lets start with what you are trying to do here. Strip ampersands(&) out of the file? Count spaces? There are easier ways to do these things.


Expert Comment

ID: 13998912
I think your setting $i=$j is creating an infinite loop which is creating an infinitely long $outp string which is taking all of your memory.

Author Comment

ID: 14001276
Thank you both.
The file is constituted of HTML tags separated by a variable number of &nbsp; (up to about 80), rendering it is not really important.
What I'm tryng to do is replace each series of contiguous &nbsp; instances with a user made tag around the number representing the number of contiguous &nbsp; between 2 HTML tags: example [37]
I'm using [ and ] to enclose the value and I'm using chr($cont) to represent the value as this uses only a single byte.

I think all the above should work, what I thought might not work is that each time an occurence of &nbsp; is found, the value of the index in the first for loop should be increased by 6 which is equal to giving the value of $j (from the second for loop) to $i (in the first for loop) and I know this doesn't work in some interpreters (like some BASIC in the old days).

If this is the case, perhaps you can advise a better way to code this that wouldn't create an infinite loop.  I do not have time to learn PHP by trial and errors and as soon as I hit a problem, I usually need help.
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LVL 49

Expert Comment

ID: 14001793
rblampain, you wouldn't want to use [ chr($cont) ], because possibly somehow sometime there might be a string longer than 255 repeating elements of &nbsp; (although this offcourse can be tested using conditional statements).

However, a possible working code example which looks somewhat more simpeler than yours would be:


//this string has to be magically turned into <tag>[4]</tag><tag>2</tag>
$string = '<tag>&nbsp;&nbsp;&nbsp;&nbsp;</tag><tag>&nbsp;&nbsp;</tag>';

$token = '&nbsp;';
$toklen = strlen($token);

while(false !== ($start = strpos($string, $token))) //detect the occurence of '&nbsp;'
  $left = substr($string,0, $start);
  $string = substr($string,$start);
  $tokens = 0;
  while(substr($string,0,$toklen) == $token)
    $string = substr($string, $toklen);
  $string = $left.'['.$tokens.']'.$string;

echo htmlspecialchars($string);

LVL 49

Expert Comment

ID: 14001804
You could even try this:

$string = preg_replace('/(&nbsp;)+/e', '"[".(count(explode("$token","\\0"))-1)."]"', $string);

LVL 49

Accepted Solution

Roonaan earned 2000 total points
ID: 14001807
Full code for the last post:


//this string has to be magically turned into <tag>[4]</tag><tag>2</tag>
$string = '<tag>&nbsp;&nbsp;&nbsp;&nbsp;</tag><tag>&nbsp;&nbsp;</tag>';

$token = '&nbsp;';
$string = preg_replace('/('.$token.')+/e', '"[".(count(explode("$token","\\0"))-1)."]"', $string);
echo htmlspecialchars($string).'<br/>';


Author Comment

ID: 14004678
To majestiq:
it seems my code was in trouble before reaching that line

To Roonan:
a single line of code - and it works - I'll need a few days to believe it.
No doubt you deserve the points.

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