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How to replace "City1" with random city on $substitutes

<?php 

$placeholders = 'City1 - City2 - City3 - City4';

$substitutes  = [

'City1' => ['Orlando,Dallas,Atlanta,Detroit'],

'City2' => ['Jakarta,Bandung,Surabaya'],

'City3' => ['Atlanta,Tampa,Miami'],

'City4' => ['Mandalay,Caloocan,Hai Phong,Quezon City'],

];

$replacements = ;

foreach($substitutes as $key => $choices) {

    $random_key = array_rand($choices);

    $replacements[$key] = $choices[$random_key];

}

$spun = str_replace(

    array_keys($replacements),

    array_values($replacements),

    $placeholders

);

echo $spun;

?>

And some output: Dallas - Jakarta - Miami - Mandalay

Your $substitutes array is not defined correctly. Try:

$substitutes = [

  'City1' => ['Orlando', 'Dallas', 'Atlanta', 'Detroit'],

  'City2' => ['Jakarta', 'Bandung', 'Surabaya'],

  'City3' => ['Atlanta', 'Tampa', 'Miami'],

  'City4' => ['Mandalay', 'Caloocan', 'Hai Phong', 'Quezon City']

]; 

Or if, for some reason, you can't change how $substitutes is defined, you can do the following to transform it into the proper form:

$substitutes = array_map(function ($cities) {

  return explode(',', $cities[0]);

}, $substitutes);

Try This

 <?php 

    $placeholders = 'City1 - City2 - City3 - City4';

    $substitutes  = [

    'City1' => ['Orlando,Dallas,Atlanta,Detroit'],

    'City2' => ['Jakarta,Bandung,Surabaya'],

    'City3' => ['Atlanta,Tampa,Miami'],

    'City4' => ['Mandalay,Caloocan,Hai Phong,Quezon City'],

    ];

    $replacements = ;



    foreach($substitutes as $key => $choices) {

    $element = $choices[0];

    $elements=explode(',',$element);

    $randomElement = $elements[array_rand($elements, 1)];





        $placeholders= str_replace($key, $randomElement ,$placeholders);



    }

    echo $placeholders;

    ?>

It will produce the output as

Orlando - Bandung - Tampa - Hai Phong

You can do that this way as well.

$substitutes  = [

'City1' => ['Orlando','Dallas','Atlanta','Detroit'],

'City2' => ['Jakarta','Bandung','Surabaya'],

'City3' => ['Atlanta','Tampa','Miami'],

'City4' => ['Mandalay','Caloocan','Hai Phong','Quezon City'],

];



foreach($substitutes as $city=>$cities){



  $results = $substitutes[$city][array_rand($cities)];



}



echo '<pre>';

print_r($results);

echo '</pre>';

This will output:

Array

(

    [0] => Atlanta

    [1] => Bandung

    [2] => Miami

    [3] => Hai Phong

)

You can add this line and it will output it as a string if you want.

$string = implode(' - ', $results);

echo $string;

Like so:

Atlanta - Bandung - Miami - Hai Phong

Good luck!

How to make this spun result unique ?