PHP - String String Functions

Introduction

PHP has a whole set of predefined functions that help you in interacting with strings.

Demo

<?php
     $text = '   this is a test '; 

     echo strlen($text); //ww  w  . jav a2 s  .c  o m
     $text = trim($text); 
     echo $text; 
     echo strtoupper($text); 
     echo strtolower($text); 
     $text = str_replace('is', 'are', $text); 
     echo $text; 
     echo substr($text, 2, 6); 
     var_dump(strpos($text, 'can')); 
     var_dump(strpos($text, 'could')); 
?>

Result

Here, we are playing with a string with different functions:

Function	Description
strlen	returns the number of characters that the string contains.
trim	returns the string, removing all the blank spaces to the left and to the right.
strtoupper and strtolower	return the string with all the characters in upper or lower case respectively.
str_replace	replaces all occurrences of a given string by the replacement string.
substr	extracts the string contained between the positions specified by parameters, with the first character being at position 0.
strpos	shows the position of the first occurrence of the given string. It returns false if the string cannot be found.

Related Topics

• String word Count
• String substring
• String Searching
• Searching Strings with strstr()
• Locating Text with strpos() and strrpos()
• Finding the Number of Occurrences with substr_count()
• Searching for a Set of Characters with strpbrk()
• String Replacing
• Replacing All Occurrences using str_replace()
• Replacing a Portion of a String with substr_replace()
• Justifying Text
• Translating Characters with strtr()
• String Uppercase and Lowercase
• String case sensitive search
• Trimming Strings with trim(), ltrim(), and rtrim()
• Padding Strings with str_pad()
• Wrapping Lines of Text with wordwrap()
• Write program to emulate the function call str_pad($myString, $desiredLength)

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