str_ireplace(): case in-sensitive String Replace

Case-insensitive replace with str_ireplace()

Replaces “php” with “JavaScript” (ignoring case) and prints the result.

$search = "php";
$replace="JavaScript";
$final_string = str_ireplace($search, $replace, "Sites uses PHP along with HTML");
echo $final_string;

Sites uses JavaScript along with HTML

str_ireplace(search,replace,main_string,count);

Search Array & replace string

$search = array("good", "php", "html", "ASP");
$final_string = str_replace($search, "*", "All good sites uses PHP along with HTML or they use ASP and html");
echo $final_string;

All * sites uses PHP along with HTML or they use * and *

Search array & replace array

$search = array("server", "php", "JSP", "asp");
$replace=array("client","HTML","JavaScript","CSS");
$final_string = str_ireplace($search, $replace, " Server side scripts are jsp, PHP and ASP ");
echo $final_string;

client side scripts are JavaScript, HTML and CSS

Using optional parameter count to know the number of replacements

$search = array("server", "php", "JSP", "asp");
$replace=array("client","HTML","JavaScript","CSS");
$final_string = str_ireplace($search, $replace, " Server side scripts are jsp, PHP and ASP ",$count);
echo $final_string;
echo "<br>Number of replacement= $count ";

client side scripts are JavaScript, HTML and CSS 
Number of replacement= 4

Generate a clean prompt with str_ireplace() to use in AI tools

Pick one random keyword from a list and inject it into a reusable paragraph to build a posting prompt to AI Models. Case-insensitive replacement keeps the template simple and robust.

<?php
/**
 * Practical use of str_ireplace():
 * Pick a random keyword from an array, inject into a prompt paragraph,
 * and (optionally) call your AI API to generate a social media post.
 */

// 1) Your keyword pool (expand as you like)
$keywords = [
    'Tkinter Treeview insert',
    'tkcalendar DateEntry',
    'PHP array unpacking',
    'MySQL BETWEEN query',
    'Regex with preg_match',
    'Python file handling',
];

// 2) Prompt paragraph with a case-insensitive placeholder {KEYWORD}
$promptTemplate = <<<TXT
Create a ~1500-character Google My Business post on: {KEYWORD}.

Audience: beginners/intermediate devs.
Focus: Explain ONE core outcome, include 1 tiny code line (no long blocks), and end BEFORE 1500 chars.
Tone: clear, helpful, no hype. Avoid keyword stuffing.
TXT;

// 3) Pick ONE keyword at random
if (empty($keywords)) {
    die("No keywords available.\n");
}
$randomKey = array_rand($keywords);
$selected  = $keywords[$randomKey];

// 4) Case-insensitive replacement (all occurrences)
//    {KEYWORD}, {keyword}, {KeyWord} … all replaced
$replacedCount = 0;
$finalPrompt = str_ireplace('{KEYWORD}', $selected, $promptTemplate, $replacedCount);

// 5) Show the ready-to-send prompt (you can stop here if you just copy/paste)
header('Content-Type: text/plain; charset=UTF-8');
echo "Selected keyword: {$selected}\n";
echo "Occurrences replaced: {$replacedCount}\n\n";
echo "---- PROMPT TO SEND ----\n";
echo $finalPrompt . "\n";
?>

Create a ~1500-character Google My Business post on: tkcalendar DateEntry.

Audience: beginners/intermediate devs.
Focus: Explain ONE core outcome, include 1 tiny code line (no long blocks), and end BEFORE 1500 chars.
Tone: clear, helpful, no hype. Avoid keyword stuffing.

Subhendu Mohapatra

Author & Instructor at plus2net

I write and maintain practical tutorials on Python, PHP, SQL, JavaScript, HTML, jQuery, and web development at plus2net. The tutorials focus on clear explanations, working examples, and code that readers can test and adapt while learning.

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