CODEWITHSUNDEEP
php
riad
riad

Reputation: 7194

How to identify a string starts and ends with a numeric value in PHP

I need to identify that a string starts and ends with a numeric value and 7 digit long.

Let- 1000453 or 0984567 . Those two string is start with a numeric value and end with a numeric value.If any string start with any character let say - a234567 than it show fail.

pls kindly suggest in PHP.

Thanks in advance

Upvotes: 0

Views: 303

Answers (5)

mesch
mesch

Reputation: 195

In addition to the solutions using regular expressions above, the following should also do the job. I haven't tested it though!

$result = TRUE;

if (strlen($string) == 7) { $string_arr = str_split($string); if (!(ctype_digit($string_arr[0]] && ctype_digit($string_arr[6]))) $result = FALSE;
} else $result = FALSE;

return $result;

Upvotes: 0

Mike Sherrill 'Cat Recall'
Mike Sherrill 'Cat Recall'

Reputation: 95582

is_numeric() is mildly risky. The string '1e5' might mean 10000 in scientific notation, but it might not.

Your problem calls for a regular expression.

/[0-9][0-9][0-9][0-9][0-9][0-9][0-9]/

or the simpler

/[0-9]{7}/

Upvotes: 0

kushalbhaktajoshi
kushalbhaktajoshi

Reputation: 4678

Try this

<?php

$string = "984f1a3";

if(strlen($string) <= 7){
    if(!is_numeric(substr($string, 0, 1)) and !is_numeric(substr($string, strlen($string)-1, strlen($string)))) echo "FAIL";
    else echo "Success";
}
else echo "FAIL";

Upvotes: 0

paxdiablo
paxdiablo

Reputation: 881463

You should be able to use a regex for this:

$count = preg_match ('/^[0-9].{5}[0-9]$/', $value)

That basically gives you every string that starts and ends with a digit with any five characters in-between. $count is the number of matches found with non-zero meaning it matched.

If you want a different pattern, just adjust the regex. For example, seven characters, all numeric would be '/^[0-9]{7}$/'.

Keep in mind I'm old-school and still use [0-9] for digits since not all regex engines support the \d notation, but PHP should be okay with that (such as '/^\d{7}$/').

Upvotes: 8

Intrepidd
Intrepidd

Reputation: 20878

Do you want only numbers?

Then this should work 

if (preg_match("/^[0-9]{7}$/", $argv[1]))
  {
    echo "Ok";
  }

If you also want to have other possible values in the string the regex of paxdiablo is right.

Upvotes: 1

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