count(): counts the number of elements in the array;
sizeof(): has the same purpose as count(). Both functions can return the number of array elements. You can get the number of elements in a regular scalar variable. If the array passed to this function is an empty Array, or a variable that has not been set, the number of array elements returned is 0;
array_count_value(): Count the number of times each specific value appears in the array $array;
For example:
$array=array(4,5,1,2,3,1,2,1); $ac=array_count_value($array);
will create an array named $ac, which includes:
关键字 值 4 1 5 1 1 3 2 2 3 1
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$arr = array( '1011,1003,1008,1001,1000,1004,1012', '1009', '1011,1003,1111' ); $result = array(); foreach ($arr as $str) { $str_arr = explode(',', $str); foreach ($str_arr as $v) { $result[$v] = isset($result[$v]) ? $result[$v] : 0; $result[$v] = $result[$v] + 1; } } print_r($result);
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