<?php
$data = [
['linea' => '1 La Defense - Chateau de Vincennes'],
['linea' => '2 Porte Dauphine - Nation'],
['linea' => '3 Pont de Levallois Becon - Gallieni'],
['linea' => '3bis Gambetta - Porte des Lilas'],
['linea' => '4 Porte de Clignancourt - Mairie de Montrouge'],
['linea' => '5 Bobigny Pablo Picasso - Place d�Italie'],
['linea' => '6 Charles de Gaulle Etoile - Nation'],
['linea' => '7 Louis Leblanc - Pre Saint Gervais'],
['linea' => '8 Balard - Pointe du Lac'],
['linea' => '9 Pont de S�vres - Mairie de Montreuil'],
['linea' => '10 Boulogne Pont de Saint Cloud - Gare d�Austerlitz'],
['linea' => '11 Chatelet - Mairie des Lilas'],
['linea' => '12 Front Populaire - Mairie d�Issy'],
['linea' => '13 Gare Saint Lazare - Olympiades']
];
$data = array_column($data, 'linea');
echo json_encode($data);
["1 La Defense - Chateau de Vincennes","2 Porte Dauphine - Nation","3 Pont de Levallois Becon - Gallieni","3bis Gambetta - Porte des Lilas","4 Porte de Clignancourt - Mairie de Montrouge","5 Bobigny Pablo Picasso - Place d\ufffdItalie","6 Charles de Gaulle Etoile - Nation","7 Louis Leblanc - Pre Saint Gervais","8 Balard - Pointe du Lac","9 Pont de S\ufffdvres - Mairie de Montreuil","10 Boulogne Pont de Saint Cloud - Gare d\ufffdAusterlitz","11 Chatelet - Mairie des Lilas","12 Front Populaire - Mairie d\ufffdIssy","13 Gare Saint Lazare - Olympiades"]
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
["1 La Defense - Chateau de Vincennes","2 Porte Dauphine - Nation","3 Pont de Levallois Becon - Gallieni","3bis Gambetta - Porte des Lilas","4 Porte de Clignancourt - Mairie de Montrouge","5 Bobigny Pablo Picasso - Place d\ufffdItalie","6 Charles de Gaulle Etoile - Nation","7 Louis Leblanc - Pre Saint Gervais","8 Balard - Pointe du Lac","9 Pont de S\ufffdvres - Mairie de Montreuil","10 Boulogne Pont de Saint Cloud - Gare d\ufffdAusterlitz","11 Chatelet - Mairie des Lilas","12 Front Populaire - Mairie d\ufffdIssy","13 Gare Saint Lazare - Olympiades"]