PHP String Functions
PHP provides many built-in functions for manipulating strings.In this chapter we will look at some commonly used functions to manipulate strings.
> Using the strlen() function
This function Returns the length of a string.
<?php echo strlen("Hello world!"); // outputs 12 ?>
> Using the trim() function
This function use to removes whitespace or other characters from both sides of a string.
<?php echo trim(" Hello world! "); ?>
> Using the str_word_count() function
This function use to counts the number of words in a string.
<?php $my_str = 'This is PHP tutorial.'; echo str_word_count($my_str); ?>
> Using the strpos() function
This function use to search for a string or character within a string.
<?php echo strpos("Hello world!","world"); ?>
> Using the str_replace() function
This function use to replaces all occurrences of the search text within the target string.
<?php $my_str = 'This is PHP tutorial.'; echo str_replace("tutorial","website",$my_str); ?>
> Using the strrev() function
This function use to reverses a string.
<?php $my_str = 'This is PHP tutorial.'; echo strrev($my_str); ?>
> Using the substr() function
This function use to returns a specif part of string.
<?php echo substr("Hello world",-5); ?>
> Using the strtoupper() function
This function use to convert all characters to uppercase.
<?php echo strtoupper("Hello WORLD!"); ?>
> Using the lowercase() function
This function use to convert all characters to lowercase.
<?php echo strtolower("Hello WORLD!"); ?>