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Modifying PHP Strings

PHP provides several functions for modifying strings, including:

  • strtolower(): Converts a string to lowercase.
  • strtoupper(): Converts a string to uppercase.
  • trim(): Removes whitespace from the beginning and end of a string.
  • substr(): Extracts a portion of a string.
  • str_replace(): Replaces a portion of a string with another string.
  • str_split(): Splits a string into an array.
  • implode(): Joins an array of strings into a single string.

Example of Modifying PHP Strings

<?php
$string = 'Hello, World!';

echo strtolower($string) . "\n";
// Outputs: hello, world!
echo strtoupper($string) . "\n";
// Outputs: HELLO, WORLD!
echo trim($string) . "\n";
// Outputs: Hello, World!
echo substr($string, 0, 5) . "\n";
// Outputs: Hello
echo str_replace('World', 'Earth', $string) . "\n";
// Outputs: Hello, Earth!
$stringArray = str_split($string);
echo implode('-', $stringArray) . "\n";
// Outputs: H-e-l-l-o-,- -W-o-r-l-d-!
?>

Output:

hello, world!
HELLO, WORLD!
Hello, World!
Hello
Hello, Earth!
H-e-l-l-o-,- -W-o-r-l-d-!

Explanation: This example demonstrates the use of several functions for modifying strings in PHP, including strtolower(), strtoupper(), trim(), substr(), str_replace(), str_split(), and implode().

Single Line Example

<?php  
 echo strtolower('HELLO WORLD!') . "\n";
 echo strtoupper('hello world!') . "\n";
 echo trim('   Hello World!   ') . "\n";
 echo substr('Hello World!', 0, 5) . "\n";
 echo str_replace('World', 'Earth', 'Hello World!') . "\n";
 $stringArray = str_split('Hello World!');
 echo implode('-', $stringArray); ?>

Output:

hello world!
HELLO WORLD!
Hello World!
Hello
Hello Earth!
H-e-l-l-o- -W-o-r-l-d-!
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