debug_backtrace()函数生成 backtrace（回溯跟踪）；
z/z/zz/a.php
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class
a{
function
__construct()
{
print_r(debug_backtrace());
}
}
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这样调用时
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include
'z/z/zz/a.php'
;
new
a();
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有
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Array
(
[0] => Array
(
[file] => D:\AMP\web\ide_tmp.php
[line] => 4
[function] => __construct
[class] => a
[object] => a Object
(
)
[type] => ->
[args] => Array
(
)
)
)
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