当我执行此代码时，我会看到一条通知：
Notice: Undefined offset: 3 [www/words/great_words.php, line 12]
Notice: Undefined offset: 6 [www/words/great_words.php, line 12]
Notice: Undefined offset: 9 [www/words/great_words.php, line 12]
Notice: Undefined offset: 12 [www/words/great_words.php, line 12]
Notice: Undefined offset: 15 [www/words/great_words.php, line 12]
Notice: Undefined offset: 18 [www/words/great_words.php, line 12]
Notice: Undefined offset: 21 [www/words/great_words.php, line 12]
Notice: Undefined offset: 24 [www/words/great_words.php, line 12]
我用过的：
<?php
$bin = array ("1","2","3","4","5","6","7","8","9");
$tol = 9;
$recive_wrd = $bin[0];
for($x=1; $x < $tol; $x++)
{
$recive_wrd = $recive_wrd.$bin[$x]; // <=== Line 12
}
$binary[$kbin] = $recive_wrd;
?>