如何计算数组中值等于常量的元素的数量？
例子，
$myArray = array("Kyle","Ben","Sue","Phil","Ben","Mary","Sue","Ben");
如何直接知道里面有多少个“Ben”？
$array = array("Kyle","Ben","Sue","Phil","Ben","Mary","Sue","Ben");
$counts = array_count_values($array);
echo $counts['Ben'];
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