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PHP String

  • Hello guys ! In this tutorial we will learn about PHP String !
  • In PHP, strings can be defined using single quotes (''), double quotes ("") or the heredoc syntax (<<<). Here's an example of defining a string using "double" quotes:

PHP Example

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<!DOCTYPE html>
<html>
<body>

<?php
  $string = "Hello world";
?>


</body>
</html>

Output

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Hello World


PHP String Function

  • PHP provides numerous functions to manipulate and work with strings. Let's explore some commonly used string operations:

PHP Concatenation:

  • You can concatenate (join) two or more strings using the concatenation operator (.) or the concatenation assignment operator(.=).

PHP Example

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<!DOCTYPE html>
<html>
<body>

<?php
  $string1 = "Hello";
  $string2 = "World";
  $concat = $string1.$string2;
  echo $concat;
?>


</body>
</html>

Output

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Hello World


PHP Srting length :

  • The strlen() function is used to determine the length of a string, which is the number of characters it contains.

PHP Example

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<!DOCTYPE html>
<html>
<body>

<?php 
  $string = "Hello, world!";
  $length = strlen($string);
  echo $length;
?>


</body>
</html>

Output

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13


PHP Substring Extraction:

  • You can extract a portion of a string using the substr() function. It takes the string and the starting index as arguments, and optionally, the length of the substring.

PHP Example

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<!DOCTYPE html>
<html>
<body>

<?php
  $string = "Hello, world!";
  $sub = substr($string, 0, 5); 
  echo $sub;
?>


</body>
</html>

Output

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Hello


PHP Searching and Replacing:

  • PHP provides functions like strpos() and str_replace() to search for specific substrings within a string and replace them with new values.

PHP Example

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<!DOCTYPE html>
<html>
<body>

<?php
 $string = "Hello, world!";
 $position = strpos($string, "world");
 $newString = str_replace("world", "PHP", $string); 
?>


</body>
</html>

Output

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Hello, PHP !


PHP Case Manipulation :

  • PHP has functions to convert strings between different cases, such as strtolower() (to lowercase), strtoupper() (to uppercase), and ucfirst() (to capitalize the first character).

PHP Example

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<!DOCTYPE html>
<html>
<body>

<?php
  $string = "hello, world!";
  $lowercase = strtolower($string); 
  $uppercase = strtoupper($string); 
  $capitalized = ucfirst($string);
  echo $lowercase;
  echo $uppercase;
  echo $capitalized;
?>


</body>
</html>

Output

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hello, world! HELLO, WORLD! Hello, world!