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Homephp教程php手册PHP获取数组长度或某个值出现次数的方法,php数组

PHP获取数组长度或某个值出现次数的方法,php数组

本文实例讲述了PHP获取数组长度或某个值出现次数的方法。分享给大家供大家参考。具体分析如下:

count():对数组中的元素个数进行统计;

例如:

$arr = Array('0','1','2','3','4');
echo count($arr); // 输出 5

sizeof()和count()具有同样的用途,这两个函数都可以返回数组元素个数.可以得到一个常规标量变量中的元素个数,如果传递给这个函数的数组是一个空数组,或者是一个没有经过设定的变量,返回的数组元素个数就是0;

array_count_value() 统计每个特定的值在数组$array中出现过的次数;
例如:

$array=array(4,5,1,2,3,1,2,1);
$ac=array_count_value($array);

将创建一个名为$ac数组,该数组包括:

关键字       值
4              1
5              1
1              3
2              2
3              1

希望本文所述对大家的php程序设计有所帮助。

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