PHP Strings

A string is series or collection of characters, where a character is the same as a byte. This means that PHP only supports a 256-character set, and hence does not offer native Unicode support.

• A string is series or collection of characters
• The simplest way to create a string is to enclose the string literal (i.e. string characters) in single quotation marks 'hello word'

PHP String Example

<?php echo 'this is a simple string'; ?>

we will look at most commonly used functions to manipulate strings.

PHP String Functions

• strtoupper() Return the upper case of a String
• strtolower() Return the lower case of a String
• strlen() - Return the Length of a String
• str_word_count() - Count Words in a String
• strrev() - Reverse a String
• strpos() - Search For a Text Within a String
• str_replace() - Replace Text Within a String

PHP strtoupper() Function

The strtoupper() function is used to convert a string into upper case. This function takes a string as parameter and converts all the lower case English alphabets present in the string to uppercase .

Syntax

strtoupper(string)

Example

<?php echo str_replace("Hello I am a Dev "); ?>

Out Put

//HELLO I AM A DEV

PHP strtolower() Function

The strtolower() function is used to convert a string into lower case. This function takes a string as parameter and converts all the uppercase English alphabets present in the string to lower case.

Syntax

strtolower(string)

Example

<?php echo strtolower("Hello I am a Dev "); ?>

Out Put

//hello i am a dev

PHP strlen() Function

The PHP strlen() predefine function in PHP which returns the length of a given string. It takes a string as a parameter and returns its length.

Syntax

strlen(string)

Example

<?php echo strlen("Hello"); ?>

Out Put

// 5

PHP str_word_count() Function

The PHP str_word_count() predefine function in PHP which returns the total number of word in the string. It takes a string as a parameter and returns its number of word.

Syntax

str_word_count(string)

Example

<?php echo str_word_count("Hello World !"); ?>

Out Put

// 2

PHP strrev() Function

The PHP strrev() predefine function in PHP this is used to reverse a string

Syntax

strrev(string)

Example

<?php echo strrev("Hello World !"); ?>

Out Put

//!dlroW olleH

PHP strpos() Function

The PHP strpos() predefine function in PHP this function use to finds the position of the first occurrence of a string inside another string.

Syntax

strpos(string)

Example

<?php echo strpos("Hello World !","World"); ?>

Out Put

// 6

PHP str_replace() Function

The PHP str_replace() predefine function in PHP this function use to replaces some characters with some other characters in a string.

Syntax

str_replace(search,replace,string,count)

Example

<?php echo str_replace("_","-","this_is_url_string"); ?>

Out Put

//this-is-url-string