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var_dump(isset($a['cake']['a']['b'])); 什么意思？该如何解决

WBOY
WBOYOriginal
2016-06-13 11:41:361098browse

var_dump(isset($a['cake']['a']['b'])); 什么意思？
http://us1.php.net/manual/zh/function.isset.php

<?php<br /><br />$a = array ('test' => 1, 'hello' => NULL, 'pie' => array('a' => 'apple'));<br /><br />var_dump(isset($a['test']));            // TRUE<br />var_dump(isset($a['foo']));             // FALSE<br />var_dump(isset($a['hello']));           // FALSE<br /><br />// 键 'hello' 的值等于 NULL，所以被认为是未置值的。<br />// 如果想检测 NULL 键值，可以试试下边的方法。 <br />var_dump(array_key_exists('hello', $a)); // TRUE<br /><br />// Checking deeper array values<br />var_dump(isset($a['pie']['a']));        // TRUE <br />var_dump(isset($a['pie']['b']));        // FALSE<br />var_dump(isset($a['cake']['a']['b']));  // FALSE<br /><br />?> <br />

var_dump(isset($a['pie']['a']));   和var_dump(isset($a['cake']['a']['b']));是什么意思?请详细解释一下,我之前学过c语言,但是感觉php为什么如此难懂.. 

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