PHP中有些类似于函数的东西其实不是函数，如 echo exit unset print 等。 怎么可以快速知道这些是函数还是结构呢？
测试脚本：
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<?php print_r(token_get_all(file_get_contents(__FILE__))); print ""; echo ""; unset($a); |
执行脚本： php test.php
如果被解析为 307 就是函数，否则就可能是结构（或别的什么）。
{当然您也可以直接查手册，手册中基本会提到的}
还可以用function_exists()来测试
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Array ( [0] => Array ( [0] => 367 [1] => <?php ) [1] => Array ( [0] => 307 [1] => print_r ) [2] => ( [3] => Array ( [0] => 307 [1] => token_get_all ) [4] => ( [5] => Array ( [0] => 307 [1] => file_get_contents ) [6] => ( [7] => Array ( [0] => 364 [1] => __FILE__ ) [8] => ) [9] => ) [10] => ) [11] => ; [12] => Array ( [0] => 370 [1] => ) [13] => Array ( [0] => 266 [1] => print ) [14] => Array ( [0] => 370 [1] => ) [15] => Array ( [0] => 315 [1] => "" ) [16] => ; [17] => Array ( [0] => 370 [1] => ) [18] => Array ( [0] => 316 [1] => echo ) [19] => Array ( [0] => 370 [1] => ) [20] => Array ( [0] => 315 [1] => "" ) [21] => ; [22] => Array ( [0] => 370 [1] => ) [23] => Array ( [0] => 348 [1] => unset ) [24] => ( [25] => Array ( [0] => 309 [1] => $a ) [26] => ) [27] => ; [28] => Array ( [0] => 370 [1] => ) [29] => Array ( [0] => 300 [1] => exit ) |
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