PHP Program to Reverse String Function with Explanation
PHP
Easy
PHP Functions
30 views
1 min read
80 words
This problem helps you practice core PHP fundamentals in a practical way. It builds intuition around function, reversed, one. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Write a function reverseStr(s) and print the reversed string.
Input Format
One line string s.
Output Format
One line reversed.
Constraints
|s|
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
<?php
$inputText=rtrim(stream_get_contents(STDIN));
if($inputText==='') exit;
function reverseStr($t){
$out='';
for($i=strlen($t)-1;$i>=0;$i--) $out.=$t[$i];
return $out;
}
echo reverseStr($inputText);
?>
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Solution Guide
Problem
Write a function reverseStr(s) and print the reversed string.
Input / Output
Output
One line reversed.
Details
Common Mistakes
- Misreading input/output format.
- Not handling constraints and edge cases.
- Off-by-one errors in loops.
- Forgetting to reset variables between test cases (if any).
Official Solution
<?php
$inputText=rtrim(stream_get_contents(STDIN));
if($inputText==='') exit;
function reverseStr($t){
$out='';
for($i=strlen($t)-1;$i>=0;$i--) $out.=$t[$i];
return $out;
}
echo reverseStr($inputText);
?>
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