here is my sample program:
<xmp>
<?
Header("Content-type: image/png");
$w = 44;
$h = 96;
$margin = 20;
$im = imagecreate($w, $h);
$white = imagecolorallocate($im, 255, 255, 255);
$black = imagecolorallocate($im, 0, 0, 0);
$red = imagecolorallocate($im, 255, 0, 0);
imagefill($im, 1, 1, $white);
//imagerectangle($im, 0, 0, $w-1, $h-1, $red);
imageline($im, $margin, 0, $margin, $h-1, $black);

for ($i=0; $i<32; $i++)
{
	imageline ($im, $margin, $i * 3, $i%5==0 ? 10+$margin : 5+$margin, $i * 3, $black);
	if (($i>9) && ($i%10==0))
	{
		imageString($im, 0, $margin + 12, ($i * 3) - 3, strval($i), $black);
	}
}
imagettftext ($im, 2, 0, 0, $h/2, $red, "./arial.ttf", "test");
imagePNG($im);
imageDestroy($im);
?>
</xmp>


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(gdb) run -X
Starting program: /usr/local/apache/bin/httpd -X
Cannot access memory at address 0x404822b4
(gdb) bt
#0  0x4000a531 in _dl_debug_state () at dl-debug.c:57
#1  0x4013cac0 in _dl_close (map=0x80d6b70) at dl-close.c:195
#2  0x400693bb in dlclose_doit (handle=0x80d6b70) at dlclose.c:26
#3  0x4000a22e in _dl_catch_error (errstring=0x4006b05c, 
    operate=0x400693a0 <dlclose_doit>, args=0x80d6b70) at dl-error.c:141
#4  0x4006991f in _dlerror_run (operate=0x400693a0 <dlclose_doit>, 
    args=0x80d6b70) at dlerror.c:125
#5  0x4006938d in dlclose (handle=0x80d6b70) at dlclose.c:32
#6  0x8089526 in ap_os_dso_unload ()
#7  0x8066e59 in unload_module ()
#8  0x8069621 in run_cleanups ()
#9  0x8067c93 in ap_clear_pool ()
#10 0x8078a0c in standalone_main ()
#11 0x807936c in main ()
#12 0x40084c7e in __libc_start_main (main=0x8078fd4 <main>, argc=2, 
    argv=0xbfffefe4, init=0x804ecd0 <_init>, fini=0x80ae884 <_fini>, 
    rtld_fini=0x4000a490 <_dl_fini>, stack_end=0xbfffefdc)
    at ../sysdeps/generic/libc-start.c:92