CODEWITHSUNDEEP
phpstring-comparison
silverkid
silverkid

Reputation: 9583

partial string comparision in php

i have stored two ip address values in two strings

a = '116.95.123.111'
b = '116.95.122.112'

i just want to compare the first two parts of ip address i.e 116.95 part in the two strings and as it is same in both the strings my comparison should return true. how to do this partial string comparison in PHP?

Upvotes: 0

Views: 903

Answers (3)

ty812
ty812

Reputation: 3323

IP adresses can contain leading zeroes. When exploding, they can be compared to as integers, so that leading zeroes are ignored.

$a = "116.95.123.111";
$b = "116.095.123.111"   // same IP as $a, but with leading zero

The "clean" way would be by something like this...

$ip1 = explode(".", $a);
$ip2 = explode(".", $b);

if (($ip1[0] == $ip2[0]) && (ip1[1] == $ip2[1])) {
  // success. Do something
} else {
  // not valid
}

Upvotes: 4

user187291
user187291

Reputation: 53950

in this particular case (comparing ip addresses) 

if((ip2long($a) >> 16) == (ip2long($b) >> 16)) echo "equal";

Upvotes: 4

OverLex
OverLex

Reputation: 2521

substr_compare is binary safe.

Upvotes: 5

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