how to search a string in a stirng using php

thangasornam · **Posted:** Wed Jun 02, 2010 12:03 pm

Hi

how to search a particular string in a string

for example i want to search a string "this " in the sentence "this is the new world"

using strpos() we search the string and identify the position of the string

sample code:

Code:

<?php
$str="hai this is new world";
$pos=strpos($str,"this");
if($pos==false)
{
 echo "search string not found";
 
}
else
{
 echo "the search string found in position".$pos;
}
?>

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anbarasank · **Posted:** Wed Jun 02, 2010 12:55 pm

You can also use strstr() php function for find whether the given input string is available or not.

Code:

<?php
$str="hai this is new world";
$pos=strstr($str,"this");
if($pos==false)
{
echo "search string not found";

}
else
{
echo "the search string found in position".$pos;
}
?>

It returns the portion of string, or FALSE if needle is not found.

This function is case-sensitive. For case-insensitive searches, use stristr().

The equivalent function for search whether a particular character or substring exists within a string in Javascript is, indexOf().

The indexOf() function allows you to search whether a particular character or substring exists within a string, if so , where the first character of the character/substring is located.

If no match is found, "-1" is returned instead. See below code.

Code:

var str="hai this is new world"
if (str.indexOf("hai")!=-1)
 alert("hai is in there!")

Anbarasan k

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jmut · **Joined:** Thu Jun 03, 2010 5:53 am **Posts:** 10

strpos is fastest function to use but have in mind return value of 0 is perfectly valid position!!!
So check should be type aware. Pretty big warning mark there on http://php.net/strpos

Code:

if ($pos === false) { // mind the ===

}

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