String Functions In PHP

String Functions In PHP

String Functions In PHP:

Substr():  substr() is used for collecting part of a string.

Substr(string,start index[,length])

<?php

echo substr("hello world",6,5);

?>

OutPut :  world

Substr_count():  function used for counting occurance of substring in main string.

Substr_count(string,substring[,string][,length]);

<?php

echo substr_count("hello world . the word is nice","world");

?>

Output :  1

Str-repeate($string,repeate count) : repeating a string number of times.

<?php

echo str_repeat("india",100);

?>

OutPut:

indiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindiaindia

strtolower(string) :

strtoupper(string)

strcasecmp(string1,string2)

 case insensitive string comparison. This function returns 0 it both the strings are equal otherwise it returns the numerical difference between the first non matching character(so the return value can be negative or positive or zero).

Strcmp(string1, string2) :

                                     Case sensitive string comparison . this function returns ;

0 -  it both the strings are equal.

1 – it the first string is greaterthan secong.

-1 – second string is greater than first.

<?php

$s1 = "abc";

$s2 = "aba";

$n = strcasecmp($n, $s2);

echo $n;

?>

OutPut:

-3

Str_pad() :  string pad with specified length.

Str_pad(string,length[,pad_string][,pad_type])

Where the pad type argument is a predefined constant of php and will be either of the following.

STR_PAD_LEFT

STR_PAD_RIGHT

STR_PAD_BOTH

<?php

$str ="india";

$str = str_pad($str, 20,"*",STR_PAD_BOTH);

echo strlen($str)."--".$str1."<br>";

echo STR_PAD_LEFT."--".STR_PAD_BOTH;

?>

OutPut:

20--

0—2

strip_tags() :  removing html and php tags with in a string.

                      Strip_tags(string[,allow]);

       Where string aruguement specifies the string to check and allow argument is optional which specifies allowable tags. These tags will not be removed.

<?php

$str ="<h1>indian</h1><h2>technologies</h2><b>private</b><ins>limited</ins>";

$str1 = strip_tags($str);

echo $str1."<br>";

$str2 = strip_tags($str,"<b><ins>");

echo $str2."<br>";

?>

OutPut:

indiantechnologiesprivatelimited

indiantechnologiesprivatelimited

ucwords(string) :   converts the first character of each word in a string to uppercase.

Echo ucwords(“India”);

Strtok(string,delimeter) :  splits a string into smaller strings. Used for tokenizing a string based on a delimeter.

<?php

$str ="indian technologies private limited";

$token = strtok($str, " ");

while($token)

{

    echo $token."<br>";

    $token = strtok(" ");

   

}

$data = explode(" ", $str);

print_r($data);

?>

OutPut:

indian

technologies

private

limited

Array ( [0] => indian [1] => technologies [2] => private [3] => limited )

Strtr(string,from,to): transulates certain characters in a string.

<?php

echo strtr("hilla warld", "ia","eo");

?>

<?php

echo "<br>";

$arr = array("hello"=>"hi","world"=>"earth");

echo strtr("hello world",$arr);

?>

OutPut:

hello world

hi earth

str_shuffle(string) : function used to shuffle the string in each request.

<?php

$str = "ABCDEFGHIJK1234567";

$s =  str_shuffle($str);

echo $s."<br>";

echo substr($s,0,5);

?>

OutPut:

3BJE4K5FC21A7DGH6I

3BJE4

Strpos(source string, search string):  returns the first index of the search string in source string.

<?php

$str = "Indian Tech";

echo strpos($str,"d");

echo "<br>";

echo strpos($str,"Tech");

?>

OutPut

2

7

Ord(character):  function used to get the ASCII value of a character.

<?php

echo "ASCII value of A = ".  ord('A');

?>

OutPut:

ASCII value of A = 65

Chr(ASCII value): function used to get the corresponding character value of the ASCII specified.

Echo chr(65);

OutPut :     A

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