12道PHP类型检测题目

这些题目无意之中在一个网站上找到，先做做看，你能对几道？过几天再把答案公布出来！

 

PHP Skills Test

$a .= "a"; $a .= "b"; $a .= "c"; What is the value of $a ?

$a = 4; for ($b = 0; $b <= $a; $b++) { $c++; } What is the value of $c ?

$a[] = "a"; $a[] = "b"; $a[] = "c"; What is the value of $a[2] ?

$a = 200.5; $b = 2005; $c = "2005"; Which of the above variables's type is integrer ? $

$a = '1'; $b = &$a; $b = "2$a"; What is the value of $a ?

$a = "abc"; $b = substr($a, 0, -1); What is the value of $b ?

$a = true; $b = "true"; $c[] = "true"; Which of the above variables's type is string ? $

$a = "b"; $b = "a"; What is the value of ${$b} ?

$a = array("a","b","c"); foreach ($a as $b){ $c++; } What is the value of $c ?

$a = "0"; $b = "0"; if ($a != "1" && $b == "1" || $a != "0" || $b != "1" ){ $d = "0"; }else{ $d = "1"; } What is the value of $d ?

$a = "post_processed_string"; $b = array("post_", "_"); $c = array("", " "); $d = ucwords(str_replace($b,$c,$a)); What is the value of $d ?

$a = "<tt>some</tt><b>html</b>"; preg_match("/<\w?>(\w*?)<\/\w?>/",$a,$b); What is the value of $b[1] ?