无论如何要计算一个数组在 PHP 中有多少个键？
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Is there anyway to count how many keys an array has in Php?
提问by Mohammad
Array
(
[0] => 'hello'
[1] => 'there'
[2] =>
[3] =>
[4] => 3
)
// how to get the number 5?
回答by teemitzitrone
回答by Phill Pafford
Works for me w/ NULL
为我工作，带 NULL
$array = array('hello', 'there', NULL, NULL, 3);
echo "<pre>".print_r($array, true)."</pre><br />";
echo "Count: ".count($array)."<br />";
output
输出
Array
(
[0] => hello
[1] => there
[2] =>
[3] =>
[4] => 3
)
Count: 5
A quick Google search for PHP Arrayshould pull up results of all the functions available
在Google 上快速搜索 PHP Array应该可以找到所有可用函数的结果
回答by David Kurid?a
Below code was tested with PHP 5.3.2. and the output was int 5.
下面的代码是用 PHP 5.3.2 测试的。输出为int 5.
$a = array(
0 => 'hello',
1 => 'there',
2 => null,
3 => null,
4 => 3,
);
var_dump(count($a));
Can you please provide more information about nullnot being counted? An older version maybe? Or simply messing with the rest of us? :)
你能提供更多关于null不被计算在内的信息吗？可能是旧版本？还是干脆逗弄我们其他人？:)
EDIT: well, posted wrong code :)
编辑：好吧，发布了错误的代码:)
回答by Martin Bean
echo count($array);
