PHP 4.0 Bug #4433: sizeof($array) isn't accurate
| From: | bens at saber dot net | Date: | Fri, 12 May 2000 23:36:27 +0000 |
| Subject: | PHP 4.0 Bug #4433: sizeof($array) isn't accurate | ||
| Groups: | php.dev | ||
| Request: | Send a blank email to php-dev+get-18664@lists.php.net to get a copy of this message | ||
From: bens@saber.net
Operating system: RH Linux 6.0 (2.2 kernel)
PHP version: 4.0 Release Candidate 1
PHP Bug Type: Misbehaving function
Bug description: sizeof($array) isn't accurate
<?php
function collapsearray ($example)
{
### Copy array A>B
################## See Note Below! ####################
for ($i=0; $i <= sizeof($example); $i++)
{ if ($example[$i] != "")
{
$output[$j]=$example[$i];
$j=$j+1;
}
}
### Kill array A
unset($example);
### Copy array B>A
for ($i=0; $i < sizeof($output); $i++)
{
$example[$i]=$output[$i];
}
return($example);
} ## end of function collapsearray
################## Start of program code #################
<FORM ACTION=test3.php METHOD=post>
<BR>0<INPUT TYPE=CHECKBOX Value=0 NAME=check[]><INPUT TYPE=TEXT VALUE=A NAME=ex$
<BR>1<INPUT TYPE=CHECKBOX Value=1 NAME=check[]><INPUT TYPE=TEXT VALUE=B NAME=ex$
<BR>2<INPUT TYPE=CHECKBOX Value=2 NAME=check[]><INPUT TYPE=TEXT VALUE=C NAME=ex$
<BR>3<INPUT TYPE=CHECKBOX Value=3 NAME=check[]><INPUT TYPE=TEXT VALUE=D NAME=ex$
<BR>4<INPUT TYPE=CHECKBOX Value=4 NAME=check[]><INPUT TYPE=TEXT VALUE=E NAME=ex$
<BR>5<INPUT TYPE=CHECKBOX Value=5 NAME=check[]><INPUT TYPE=TEXT VALUE=F NAME=ex$
<BR>6<INPUT TYPE=CHECKBOX Value=6 NAME=check[]><INPUT TYPE=TEXT VALUE=G NAME=ex$
<input type=submit>
</FORM>
<?php
include ("./isnum.inc");
echo "<HR>";
echo "<H2> b4 hack </H2>";
echo "0: ", $example[0];
echo "<BR>1: ", $example[1];
echo "<BR>2: ", $example[2];
echo "<BR>3: ", $example[3];
echo "<BR>4: ", $example[4];
echo "<BR>5: ", $example[5];
echo "<BR>6: ", $example[6];
echo "<BR>7: ", $example[7];
echo "<BR>8: ", $example[8];
echo "sizeof example=", sizeof($example);
echo "<HR>\n";
echo "Check size=", sizeof($check), ". ";
for ($x =0; $x < sizeof($check); $x++)
{
echo "unsetting ", $example[$check[$x]], "<BR>\n";
unset ($example[$check[$x]]);
}
$example=collapsearray($example);
echo "<HR>\n";
echo "<H2>After hack</H2>";
echo "0: ", $example[0];
echo "<BR>1: ", $example[1];
echo "<BR>2: ", $example[2];
echo "<BR>3: ", $example[3];
echo "<BR>4: ", $example[4];
echo "<BR>5: ", $example[5];
echo "<BR>6: ", $example[6];
echo "<BR>7: ", $example[7];
echo "<BR>8: ", $example[8];
echo "sizeof example= ", sizeof($example);
?>
<P> To use this code snippet, paste into a file called test3.php and run.
<P> What you'll find is that the last 1 or two lines of the array passed to the function
collapsearray do not get returned properly.
<P> Where you see "See note below!" the following line could
be modified to read
<PRE>
for ($i=0; $i <= sizeof($example)*2; $i++)
</PRE>
And it thereafter works on arrays of large size just fine.
<P> But the reasoning behind this defies any sort of logic!
<P> Compiled: /configure --with-mysql --with-apxs
<P> Apache version 1.3.12
<P> PS: Keep up the good work!
<P> -Benjamin Smith