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';

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";

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

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

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

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");

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 Strings

Single-quote strings:

Example:

Double-quote strings:

Example:

Calculating the Length of a String:

Example:

Reversing a String:

Example:

Replacing Text:

Example:

Counting Number of Words in a String:

Example:

PHP String Functions:

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