STRING FUNCTIONS IN PHP

1. strlen() – To get length of string.

Example –

<?php

$str="Welcome";

echo strlen($str);

?>

Output –

7

Note – ord() is used for getting ASCII value.

2. strtoupper() – Converts all characters of a string into uppercase.

Example –

<?php

$str="Welcome";

echo strtoupper($str);

?>

Output –

WELCOME

3. strtolower() – Converts characters of a string into lowercase.

Example –

<?php

$str="WELCOME";

echo strtolower($str);

?>

Output –

welcome

4. ucfirst() – Converts first characters of a string into upper case.

Example –

<?php

$str="welcome";

echo ucfirst($str);

?>

Output –

Welcome

5. ucwords() – Converts first character of all words into uppercase.

Example –

<?php

$str="welcome to php";

echo ucwords($str);

?>

Output –

Welcome To Php

6. nl2br() – To break new lines of string.

Example –

<?php

$str="welcome

to php

Alien";

echo nl2br($str);

?>

Output –

welcome 

to php

Alien

7. str_word_count() – To get total number of words of a string. We can pass node value, if node value is 0 then it returns total number of words. If node value is 1 then it returns each word as array elements. Element has a numeric key 0,1,etc. If node value is 2 then it returns each word as array element, keys are the index numbers of words.

Example –

<?php

$str="welcome to php Alien";

print_r(str_word_count($str,2));

?>

Output –

Array

(

    [0] => welcome

    [8] => to

    [11] => php

    [15] => Alien

)

Example –

<?php

$str="welcome to php Alien";

print_r(str_word_count($str,1));

?>

Output –

Array

(

    [0] => welcome

    [1] => to

    [2] => php

    [3] => Alien

)

Example –

<?php

$str="welcome to php Alien";

print_r(str_word_count($str,0));

?>

Output –

4

8. strip_tags() – To strip HTML of a string.

Example –

<?php

$str="<input type='button' value='click'>Scott";

echo strip_tags($str);

?>

Output –

Scott

9. htmlspecialchars() – To stop execution of HTML tags.

Example –

<?php

$str="<b><i>Scott</i></b>";

echo htmlspecialchars($str);

?>

Output –

<b><i>Scott</i></b>

10. addslashes() – To add escape slashes (backslashes /) in front of single and double quotations.

11. stripslashes() – To remove the slashes, which we added with add slashes function.

Example –

<?php

$str="Wel'come";

$str1=addslashes($str);

echo $str1;

echo "\n";

echo stripslashes($str1);

?>

Output –

Wel\'come

Wel'come

12. str_replace() – To replace a string with the new string.

Example –

<?php

$str="Welcome to PHP Earth";

echo str_replace("Earth","World",$str);

?>

Output –

Welcome to PHP World

13. strchr() – To get substring of input string from specified characters.

Example –

<?php

$str="Welcome to PHP Earth";

echo strchr($str,"c");

?>

Output –

come to PHP Earth

14. strrchr() – Same as strchr(), but it searches the specified character from reverse direction of string.

Example –

<?php

$str="Welcome Scott";

echo strrchr($str,"c");

?>

Output –

cott

15. strstr() – It is same as strchr(), to get substring of a string from specified characters.

16. stristr() – Same as strstr(), but it is case insensitive.

Example –

<?php

$str="Welcome Scott";

echo stristr($str,"C");

?>

Output –

come Scott

17. similar_text() – To get similarities between two strings.

Example –

<?php

$str="Scott";

$str1="Scott";

$str2="Smtth";

echo similar_text($str,$str1);

echo "\n";

echo similar_text($str1,$str2);

?>

Output –

5

3