How to add values to string in foreach? - php

Question

I have an array with lots of information. I want to extract some of the information:
*to a string
*To a new array
I tried doing this for a string:
$output;
foreach ($response->data as $post){
$output = $output . $post->link;
}
echo $output;
but the $output inside the foreach is undefined.
Is this a good solution? In that case how do I declare a variable with the right scope?

Answer 1

Your error appears because you're not initialising the $output variable at the beginning.
Try $output = ""; instead.
But on the other hand, a more elegant solution would be to use PHP's built-in implode() method.
Manual:
http://php.net/manual/en/function.implode.php
You could do something like this:
$output = implode(" ", $response->data);
echo $output;
UPDATE
If you want to 'implode' associative arrays, linepogl's answer to this question provides a nice example: Imploding an associative array in PHP
UPDATE 2
Here's an updated code that actually deals with the ->link part of your question:
$response_array = array();
foreach ($response->data as $post) {
$response_array[] = $post->link;
}
$output = implode(" ", $response_array);
echo $output;

Answer 2

You must define the variable before using it in foreach. Like:
$output="";
instead of
$output;

Answer 3

try this code
$output = '';
foreach ($response->data as $post){
$output = $output . $post->link;
}
echo $output;
.

Answer 4

Try
$output = '';
foreach ($response->data as $post){
$output .= $post->link;
}
echo $output;

Answer 5

Try like
$output = '';
foreach ($response->data as $post){
$output .= $post->link;
}
echo $output;
First you need to initialize the $output value as null thenonly in foreach loop concat the result to the $output.

Answer 6

$output = '';
foreach ($response->data as $post){
$output .= $post->link;
}
echo $output;
or you can use join
$output = join('',$response->data);

Answer 7

$output = array();
foreach ($response->data as $post){
$output[] = $post->link;
}
foreach( $output as $key => $value ){
echo $value;
}
To your code you might do:
$output = NULL;
foreach ($response->data as $post){
$output .= $post->link;
}
echo $output;