PHP for loop Exercises: Count a specified characters in a string

Last update on December 20 2024 10:19:05 (UTC/GMT +8 hours)

Write a program which will count the "r" characters in the text "w3resource".

Visual Presentation:

Sample Salution:

PHP Code:

<?php
// Define the text string to search within
$text = "w3resource";

// Define the character to search for
$search_char = "r";

// Initialize a counter variable to count occurrences
$count = "0";

// Loop through each character in the text string
for($x = "0"; $x < strlen($text); $x++)
  { 
    // Check if the current character matches the search character
    if(substr($text, $x, 1) == $search_char)
    {
        // Increment the counter if there's a match
        $count = $count + 1;
    }
  }

// Print the count of occurrences of the search character
echo $count."\n";

?>

Output:

2

Explanation:

In the exercise above,

• The code begins with a PHP opening tag <?php.
• It initializes three variables:
• $text: Contains the text string to search.
• $search_char: Contains the character to count.
• $count: Initializes a counter variable to count the occurrences of the search character.
• The code enters a "for" loop to iterate over each character in the text string. The loop condition is based on the length of the text string (strlen($text)).
• Within the loop, it uses "substr()" function to extract each character from the text string (substr($text, $x, 1)) and compares it with the search character ($search_char).
• If the current character matches the search character, the counter ('$count') is incremented by 1.
• After iterating through all the characters in the text string, the code prints out the count of occurrences of the search character using "echo".
• Finally, PHP code ends with a closing tag ?>.

Flowchart:

PHP Code Editor:

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