$ only_integers === array_filter（$ only_integers，'is_int'）; //真
$ letters_and_numbers === array_filter（$ letters_and_numbers，'is_int'）; //假
 

这将有助于你在未来定义两个帮手，高阶函数：

  / **
 * $告诉阵列的所有成员是否验证$predicate。
 *
 *所有（阵列（1，2，3），'is_int'）; - ＆GT;真正
 *所有（阵列（1，2，'A'），'is_int'）; - ＆GT;假
 * /
所有功能（$数组，$predicate）{
    返回array_filter（$数组，$predicate）=== $阵列;
}/ **
 * $告诉阵列中的任何成员是否验证$predicate。
 *
 *任何（阵列（1，'A'，'B'），'is_int'）; - ＆GT;真正
 *任何（阵列（'A'，'B'，'C'），'is_int'）; - ＆GT;假
 * /
任何功能（$数组，$predicate）{
    返回array_filter（$数组，$predicate）==阵列（）！;
}
 

How do you verify an array contains only values that are integers?

I'd like to be able to check an array and end up with a boolean value of true if the array contains only integers and false if there are any other characters in the array. I know I can loop through the array and check each element individually and return true or false depending on the presence of non-numeric data:

For example:

$only_integers = array(1,2,3,4,5,6,7,8,9,10);
$letters_and_numbers = array('a',1,'b',2,'c',3);

function arrayHasOnlyInts($array)
{
    foreach ($array as $value)
    {
        if (!is_int($value)) // there are several ways to do this
        {
             return false;
        }
    }
    return true;
}

$has_only_ints = arrayHasOnlyInts($only_integers ); // true
$has_only_ints = arrayHasOnlyInts($letters_and_numbers ); // false

But is there a more concise way to do this using native PHP functionality that I haven't thought of?

Note: For my current task I will only need to verify one dimensional arrays. But if there is a solution that works recursively I'd be appreciative to see that to.

$only_integers       === array_filter($only_integers,       'is_int'); // true
$letters_and_numbers === array_filter($letters_and_numbers, 'is_int'); // false

It would help you in the future to define two helper, higher-order functions:

/**
 * Tell whether all members of $array validate the $predicate.
 *
 * all(array(1, 2, 3),   'is_int'); -> true
 * all(array(1, 2, 'a'), 'is_int'); -> false
 */
function all($array, $predicate) {
    return array_filter($array, $predicate) === $array;
}

/**
 * Tell whether any member of $array validates the $predicate.
 *
 * any(array(1, 'a', 'b'),   'is_int'); -> true
 * any(array('a', 'b', 'c'), 'is_int'); -> false
 */
function any($array, $predicate) {
    return array_filter($array, $predicate) !== array();
}