PHP Program to Concatenate Two Arrays with Explanation
PHP
Easy
PHP Arrays
29 views
1 min read
94 words
This problem helps you practice core PHP fundamentals in a practical way. It builds intuition around ints, two, concatenate. Let’s break it down step by step so you can implement it confidently.
Problem Statement
Given two arrays, print them concatenated.
Input Format
Line1 n m. Line2 n ints. Line3 m ints.
Output Format
One line n+m ints.
Constraints
n+m
Code Solution
This explanation is written for learning purposes and to help beginners understand the concept clearly.
<?php
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
$tokens=preg_split('/\\s+/', $inputText);
$i=0; $n=intval($tokens[$i++] ?? 0); $m=intval($tokens[$i++] ?? 0);
$output=[];
for($k=0;$k<$n;$k++) $output[] = strval(intval($tokens[$i++] ?? 0));
for($k=0;$k<$m;$k++) $output[] = strval(intval($tokens[$i++] ?? 0));
echo implode(' ',$output);
?>
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
Given two arrays, print them concatenated.
Input / Output
Input
Line1 n m. Line2 n ints. Line3 m ints.
Output
One line n+m ints.
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
$inputText=trim(stream_get_contents(STDIN));
if($inputText==='') exit;
$tokens=preg_split('/\\s+/', $inputText);
$i=0; $n=intval($tokens[$i++] ?? 0); $m=intval($tokens[$i++] ?? 0);
$output=[];
for($k=0;$k<$n;$k++) $output[] = strval(intval($tokens[$i++] ?? 0));
for($k=0;$k<$m;$k++) $output[] = strval(intval($tokens[$i++] ?? 0));
echo implode(' ',$output);
?>
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