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[2005-11-29 11:32 UTC] prgallier at yahoo dot com
Description:
------------
The below code does not store the value "55" in the variable "test" as it should, and did in PHP 5.0.5. Leaving out the global declaration allows the output to display properly. I have also had segmentation faults caused by similar routines, but have been unable to reproduce this outside of the full program.
Reproduce code:
---------------
$x = array("test", "55");
global ${$x[0]};
${$x[0]} = $x[1];
echo "Test: $test<br>\n";;
Expected result:
----------------
Displays:
Test:
Actual result:
--------------
Should display:
Test: 55
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Last updated: Tue Mar 04 06:01:27 2025 UTC |
The following generates a segfault on my system: function dotest() { $link = mysql_connect("localhost","test","test"); mysql_select_db("test"); mysql_query("CREATE TABLE config (num smallint(5) unsigned NOT NULL auto_increment, conf varchar(20) NOT NULL default '')"); mysql_query("INSERT INTO config (conf,type) VALUES('Test1','33')"); $result = mysql_query("SELECT conf,value FROM config"); while ($row = mysql_fetch_row($result)) { global ${$row[0]}; ${$row[0]} = $row[1]; } mysql_free_result($result); } dotest(); echo "Test: $test<br>\n";<?php function dotest() { $array = array(array("test", "blah"),array("test", "blah")); $i = 0; while ($row = $array[$i++]) { global ${$row[0]}; ${$row[0]} = $row[1]; } } dotest(); ?> Valgrind shows several errors: ==3742== Invalid read of size 4 ==3742== at 0x823AAEA: zend_fetch_dimension_address (zend_execute.c:1092) ==3742== by 0x826DEE0: ZEND_FETCH_DIM_R_SPEC_CV_CONST_HANDLER (zend_vm_execute.h:20390) ==3742== by 0x823B348: execute (zend_vm_execute.h:88) ==3742== by 0x823B7A9: zend_do_fcall_common_helper_SPEC (zend_vm_execute.h:222) ==3742== by 0x823E294: ZEND_DO_FCALL_SPEC_CONST_HANDLER (zend_vm_execute.h:1578) ==3742== by 0x823B348: execute (zend_vm_execute.h:88) ==3742== by 0x8214E75: zend_execute_scripts (zend.c:1090) ==3742== by 0x81D43AD: php_execute_script (main.c:1704) ==3742== by 0x828025D: main (php_cli.c:1039) etc.