CODEWITHSUNDEEP
phpintegersubstringsequence
M. Foldager
M. Foldager

Reputation: 300

Determine if a string contains a sequence of numbers

Say I have an integer 88123401, and I want to determine whether it includes a sequence of numbers like 1234, 23456, 456789, or the like of any length and from any beginning of numbers.. Is this possible at all in PHP, and if so, how would one go about finding out?

Upvotes: 4

Views: 2029

Answers (4)

Thamilhan
Thamilhan

Reputation: 13303

This might help you:

$number = "88123401";

$splittedNumbers = str_split($number);
$continuous = false;
$matches[0] = '';
$i = 0;

do {
    if ((int)(current($splittedNumbers) + 1) === (int)next($splittedNumbers)) {
        if($continuous) {
            $matches[$i] .= current($splittedNumbers);
        }
        else {
            $matches[$i] .= prev($splittedNumbers) . next($splittedNumbers);
            $continuous = true;
        }
    } else {
        $continuous = false;        
        $matches[++$i] = '';
    }
    prev($splittedNumbers);
} while (!(next($splittedNumbers) === false));

print_r(array_values(array_filter($matches)));

This lists all the matches that are sequential in an array. We can process further based on the results.

Result:

Array
(
    [0] => 1234
    [1] => 01
)

Upvotes: 0

javier_domenech
javier_domenech

Reputation: 6253

Some function with a for so you go through all the string comparing each character with its predecessor.

function doesStringContainChain($str, $n_chained_expected)
{
    $chained = 1;

    for($i=1; $i<strlen($str); $i++)
    {
        if($str[$i] == ($str[$i-1] + 1))
        {
            $chained++;
            if($chained >= $n_chained_expected)
                return true;
        }else{
            $chained = 1;
        }
    }
    return false;
}

doesStringContainChain("6245679",4); //true
doesStringContainChain("6245679",5); //false

Upvotes: 6

Wolfeh
Wolfeh

Reputation: 402

use a loop and use the answer of @jtheman

$mystring = '88123401';
$findme   = array(123,2345,34567);
foreach ( $findme as $findspecificnum ) {
    $pos = strpos($mystring, $findme);

    if ($pos === false) {
        echo "The sequence '$findme' was not found in the number '$mystring'";
    } else {
        echo "The sequence '$findme' was found in the number '$mystring'";
        echo " and exists at position $pos";
    }
}

keeping it easy and straight forward.

Upvotes: 2

jtheman
jtheman

Reputation: 7491

Treat the number as a string and search with strpos().

Example:

$mystring = '88123401';
$findme   = '1234';
$pos = strpos($mystring, $findme);


if ($pos === false) {
    echo "The sequence '$findme' was not found in the number '$mystring'";
} else {
    echo "The sequence '$findme' was found in the number '$mystring'";
    echo " and exists at position $pos";
}

Source: http://php.net/manual/en/function.strpos.php

Upvotes: 0

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