Description:
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I am using Apache 2.4 with PHP 5.4 on Windows 7 32bit. When executing the code shown, from within a private class method, the server crashes. PHP is compiled as a DSO. If the code is changed to utilize long form conditional processing the execution works.

If I use the command line to execute the script, the class loaded by require does not get called.

// my index.php
require("C:/Infinity/application/shared/classes/a.php"); 
$x = new a();

// my a.php
class a { __constructor(){ $this->import_variables($_POST); }}

further code in test script.

Test script:
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# retrieve caller name
$calledby = debug_backtrace(); print_r($calledby);
// does not work
$caller = (strlen($calledby[1]['class'])) ? $calledby[1]['class'] : $calledby[0]['class'];
// works and does does not segfault
if (strlen($calledby[1]['class']))  $caller = $calledby[1]['class'];
else                                $caller = $calledby[0]['class'];

# arguments are required
if (!func_num_args()) { return; }
# fill variables with argument contents if exists
$variables = (func_num_args() == 0) ? NULL : (is_array(func_get_arg(0)) ? func_get_arg(0) : NULL);

Expected result:
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I expect that Apache will not SEGFAULT