I want something like
array_validate('is_string',$arr);
If the array elements are all strings, then it will return TRUE.
But, if there is/are non-string type in the array, it will return FALSE.
Is there any built-in PHP function that does this?
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use foreach loop and the function is_string()NO-ONE_LEAVES_HERE– NO-ONE_LEAVES_HERE2015-10-09 08:18:54 +00:00Commented Oct 9, 2015 at 8:18
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@ArmanMalekzade I know it, but is there a more efficient way? Something like array_map or array_filter, but this one validates all of the array elements...Terry Djony– Terry Djony2015-10-09 08:20:53 +00:00Commented Oct 9, 2015 at 8:20
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1if you visit the documentation in php.net ... exactly where they describe is_string() function ... in that page there is an example of what you want to do ... so i think there is no built-in function for that ! php.net/manual/en/function.is-string.phpNO-ONE_LEAVES_HERE– NO-ONE_LEAVES_HERE2015-10-09 08:22:42 +00:00Commented Oct 9, 2015 at 8:22
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you can use : stackoverflow.com/questions/10137674/…Mohsen– Mohsen2015-10-09 08:23:13 +00:00Commented Oct 9, 2015 at 8:23
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3 Answers
Another solution using array_reduce:
function array_validate($callable, $arr)
{
return array_reduce($arr, function($memo, $value) use ($callable){ return $memo === true && call_user_func($callable,$value); }, true);
}
array_validate('is_string', ["John", "doe"]); // True
array_validate('is_string', ["John", "Doe", 94]); // false
Also, you could use other callables:
array_validate([$object, "method"], ["something"]);
array_validate("is_array", [ [], [] ]); // true
Comments
Run through array, if a element is not a string return false. If all elements are string it will reach the end off the function and return true.
function array_validate($array){
foreach($array as $arr){
if(!is_string($arr){
return false;
}
}
return true;
}
2 Comments
Terry Djony
So, there is no built-in function that does the thing?
Crecket
Not that I know off. is_string exists for a string but if you want to check an array you'll have to use a workaround
There is no built in function, but this might work for you:
function array_type_of(array $array, $type)
{
if ('boolean' === $type ||
'integer' === $type ||
'double' === $type ||
'string' === $type ||
'array' === $type ||
'resource' === $type ||
'object' === $type || // for any object
'NULL' === $type) {
foreach ($array as $v) {
if (gettype($v) !== $type) {
return false;
}
}
} else {
foreach ($array as $v) {
if (!$v instanceof $type) {
return false;
}
}
}
return true;
}
Use it as:
$array = array( /* values */ );
$istype = array_type_of($array, 'boolean');
$istype = array_type_of($array, 'integer');
$istype = array_type_of($array, 'double');
$istype = array_type_of($array, 'string');
$istype = array_type_of($array, 'resource');
$istype = array_type_of($array, 'DateTime');
$istype = array_type_of($array, 'IteratorAggregate');
