<?php
//echo base64_encode('printf("output text");'); // Generates the string used below
eval(base64_decode('cHJpbnRmKCJvdXRwdXQgdGV4dCIpOw==')); // Should print 'output text'
?>

(gdb) bt
#0 0x00007f2c59235022 in ?? () from /lib/libc.so.6
#1 0x00000000005f9e59 in php_addcslashes (str=0x3c0656d988681c07 <Address 0x3c0656d988681c07 out of bounds>, length=0, new_length=0x0, should_free=1, what=0x7f2c581cdaea "'\", wlength=6)
at /build/buildd/php5-5.3.2/ext/standard/string.c:3121
0000002 0x00007f2c581c1acb in xdebug_var_export (struc=0x7fff8205e3b8, str=0x7fff8205e3c0, level=1, debug_zval=0, options=0x1585090) at /build/buildd/xdebug-2.0.5/build-php5/xdebug_var.c:283
0000003 0x00007f2c581c1f8e in xdebug_get_zval_value (val=0x155bd10, debug_zval=0, options=0x1585090) at /build/buildd/xdebug-2.0.5/build-php5/xdebug_var.c:365
0000004 0x00007f2c581a727e in add_stack_frame (zdata=0x7f2c5bdbb068, op_array=0x155d238, type=2) at /build/buildd/xdebug-2.0.5/build-php5/xdebug.c:1081
0000005 0x00007f2c581a8984 in xdebug_execute (op_array=0x155d238) at /build/buildd/xdebug-2.0.5/build-php5/xdebug.c:1512
0000006 0x00000000006d165c in ZEND_INCLUDE_OR_EVAL_SPEC_VAR_HANDLER (execute_data=0x7f2c5bdbb068) at /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h:8576
0000007 0x00000000006bd400 in execute (op_array=0x155c710) at /build/buildd/php5-5.3.2/Zend/zend_vm_execute.h:104
0000008 0x00007f2c581a8b9e in xdebug_execute (op_array=0x155c710) at /build/buildd/xdebug-2.0.5/build-php5/xdebug.c:1562
0000009 0x000000000069512d in zend_execute_scripts (type=0, retval=0x7fff8205e920, file_count=3) at /build/buildd/php5-5.3.2/Zend/zend.c:1266
0000010 0x0000000000640d98 in php_execute_script (primary_file=0x2) at /build/buildd/php5-5.3.2/main/main.c:2288
0000011 0x0000000000726236 in main (argc=0, argv=0x1) at /build/buildd/php5-5.3.2/sapi/cli/php_cli.c:1196