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PHP Strings

A String is a sequence of characters, numbers, special characters or combination of all. You can create a string by enclosing (single quotation marks) of the string characters.

For example –

$str = "Hello World!";

You can also use double quotes to enclosed a string characters.

However single and double quotes work differently. A string enclosed by single quotes is considered string literally. But is a string contains some variables then it represent variable value in a string quoted by double quotes.

PHP String Functions – Manipulating PHP Strings

How to calculate length of a sting

Strlen() – Strlen() function helps to find the number of characters inside a string. It also counts the blank spaces inside the string.

Example –

How to Count the number of words in a string

Str_word_count() – function counts the number of words in a string.

For example

$my_str = “Welcome to Share Query Tutorial Website”;
Echo str_word_count($my_str);

How to replace text within string

Str_replace() function is used to replace all occurence of text within a string by a target string.

For example –

$str = “Welcome to the Share Query, Please Share your Query to get answer”;
//display replace string
Echo str_replace(“share”, “my”, $str);

How to Reversing a String

Strrev() – function reverse a string.

$my_str = 'You can do anything, but not everything.';
// Display reversed string
echo strrev($my_str);

Some important PHP string functions –

  • strtolower() – Converts a string to lowercase letters
  • strtoupper() – Converts a string to uppercase letters
  • ucfirst() – Converts the first character of a string to uppercase
  • ucwords() – Converts the first character of each word in a string to uppercase
  • strstr() – Finds the first occurrence of a string inside another string
  • substr() – Returns a part of a string
  • trim() – Removes whitespace or other characters from both sides of a string