checking array values are numbers

Question

How can I check values in an array that has numbers containing only four digits? If there are strings or numbers longer than four digits, I want to echo an error message.

This is correct: $searchText = '3423, 2453, 3245 , 2425, 6765';

This is wrong: $searchText = '34d23, 244353, fsddf , 2d4425, 674365';

How can I do this?

I tried something like this...

$searchText = '3423,2453,3245,2425,6765'; function validate($input) { $searchArray = array_map('trim', explode(',', $input)); foreach($searchArray as $item) { if(filter_var($item, FILTER_VALIDATE_INT) === false || strlen($item) != 4) return false; } } if(!validate($searchText)) echo 'fail'; else echo 'pass';

output is: fail why is it?

Have you tried anything?

John V.
– John V.

2012-11-03 05:59:14 +00:00
Commented Nov 3, 2012 at 5:59 — John V.
– John V., Commented Nov 3, 2012 at 5:59

Samuel Cook · Accepted Answer · 2012-11-03 05:43:33Z

3

$searchText = '3423, 2453, 3245 , 2425, 6765'; $vals = explode(",",$searchText); foreach($vals as $v){ $v = trim($v); if(is_numeric($v) && strlen($v)==4){ echo 'good to go<br>'; }elseif(is_numeric($v)){ echo 'num but not 4 digits<br>'; }else{ echo 'string<br>'; } }

answered Nov 3, 2012 at 5:43

Samuel Cook

16.9k7 gold badges56 silver badges65 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Tharanga Nuwan Kumara Over a year ago

is there a way to check before going to explode?

Samuel Cook Over a year ago

unfortunately, since it's a string, there won't be a way of telling unless you break the string down.

Xenon · Accepted Answer · 2012-11-03 06:39:39Z

2

Those aren't arrays (they're strings), but you can handle the problem by splitting the string into an array and using PHP's filtering (filter_var in this case):

if(!validate($searchText)) // fail else // pass function validate($input) { $inputArray = array_map('trim', explode(',', $input)); foreach($inputArray as $item) { if(filter_var($item, FILTER_VALIDATE_INT) === false || strlen($item) != 4) return false; } return true; }

edited Nov 3, 2012 at 6:39

answered Nov 3, 2012 at 5:49

Xenon

3,1831 gold badge20 silver badges37 bronze badges

4 Comments

Crisp Over a year ago

Your code doesn't account for whitespace in the string, and delimiter is first param to explode, not second. Try $searchArray = array_map('trim', explode(',', $searchText)); instead

Tharanga Nuwan Kumara Over a year ago

check I updated code with your solution.. but its not working.

Xenon Over a year ago

@TharangaNuwanKumara Sorry, my fault. I've edited my answer with return true at the end of the function.

Xenon Over a year ago

@TharangaNuwanKumara What do you mean? It's only working on $inputArray inside that function. It doesn't actually edit your $searchText variable.

Abhishek Saha · Accepted Answer · 2012-11-03 05:47:05Z

You can use the below logic.(If you mean "How can I check values in an array that has numbers containing only four digits? ", then below is the solution)

<?php //you can use explode() function to convert your string into array. //$searchText = '3423, 2453, 3245 , 2425, 6765'; //$searchText = explode(",",$searchText); $searchText = array('3423', '2453', '3245' , '2425', '6765'); $count = sizeof($searchText); foreach($searchText as $key=>$value) { if (is_numeric($value) && preg_match('/^\d{4}$/', $value)) { // pass } else { $count--; // fail } } if($count == sizeof($searchText)) { echo "All good"; } ?>

Community · Accepted Answer · 2017-05-23 12:12:20Z

0

replace your array variable with $ary this is return number of characters is in array

$maxlen = max(array_map('strlen', $ary));

for better explanation StackOverflow

edited May 23, 2017 at 12:12

CommunityBot

11 silver badge

answered Nov 3, 2012 at 5:43

Man Programmer

5,3662 gold badges24 silver badges21 bronze badges

1 Comment

Man Programmer Over a year ago

yes replace it will return number of characters in the certain array

Collectives™ on Stack Overflow

checking array values are numbers

4 Answers 4

2 Comments

4 Comments

Comments

1 Comment

Linked

Hot Network Questions

Collectives™ on Stack Overflow

4 Answers 4

2 Comments

4 Comments

Comments

1 Comment

Linked

Related