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PHP Strings

PHP string is a sequence of letters, numbers, special characters i.e. used to store and manipulate text. In this tutorial, we will discuss strings in detail. Everything inside quotes, single (‘ ‘) and double (” “) in PHP is considered as a string.

Single-quote strings:

To create a string in PHP, add a text inside a single-quote. It is a simple way to specify string in PHP. This type of strings does not process special characters inside quotes as shown in the below example:

Example:

<?php
// single-quote strings
$name = 'w3codingschools';
echo 'Visit $name';
?>
Try it

Double-quote strings:

In PHP, we can create string through enclosing text within double quote also. This type of strings is capable of processing special characters.

Example:

<?php
// double-quote strings
$name = "w3codingschools";
echo "Visit $name";
?>
Try it
Following are the some of important escape sequences that are used with double-quoted strings:
  • “\n” is replaced by a new line
  • “\t” is replaced by a tab space
  • “\r” is replaced by a carriage return
  • “\$” is replaced by a dollar sign
  • “\\” is replaced by a backslash
  • “\”” is replaced by a double quote
  • “\'” is replaced by a single quote

Calculating the Length of a String:

The strlen() function is used to calculate the length of string. It also count the blank space inside the string.

Example:

<?php
echo strlen("Hello w3codingschools");   // output: 21
?>
Try it

Reversing a String:

The strrev() function returns a reverse string. This function takes a string as an argument and returns its reversed string.

Example:

<?php
echo strrev("Hello w3codingschools");   // output: sloohcsgnidoc3w olleH
?>
Try it

Replacing Text:

The str_replace() function replaces all occurrences of the search text within the target string.

Example:

<?php
echo str_replace("Welcome", "Visit", "Welcome to w3codingschools");
// output: Visit to w3codingschools
?>
Try it

Counting Number of Words in a String:

The str_word_count() function calculate the number of words in a string.

Example:

<?php
echo str_word_count("Welcome to w3codingschools");
?>
Try it

PHP String Functions:

Sr.No. Function Description
1 strlen() Calculates the number of characters in a string
2 str_repeat() Repeats a string no. of times you want
3 strrev() Retrun reverse of a given string
4 substr() Retrieves a section of a string
5 str_word_count() Calculates the number of words in a string
6 strcmp() Compares two strings
7 trim() removes leading and trailing whitespaces from a string
8 str_replace() Replaces parts of a string
9 strtoupper() Converts in Uppercases a string
10 strtolower() Converts in Lowercases a string

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PHP Data Types
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