PHP : How to get a specific value of an array - php

Question

I would like to get the id of a specific value in my phpmyadmin table.
So, I have got a table with 'id_cal' as an A.I. id, 'mois' representing the month with numbers (e.g 1 for january) and 'annee' representing the year. (see calendar table)
I am trying to set php variable for the month and the year and if they match the current month and year, I want to get this specific id.
I commented the php code where I am having my trouble, here it is :
<?php
include_once('config.php');
$m = idate('n');
$y = idate('Y');
echo $m; echo "\t"; echo $y; echo "<br>"; echo "<br>"; // The result of this is 7 2019
$reponse = $bdd->query('SELECT * FROM calendrier');
while($donnees= $reponse->fetch()){
$mois = $donnees['mois'];
$year = $donnees['annee'];
$id_cal = $donnees['id_cal'];
echo $id_cal;
echo "\t";
echo $mois;
echo "\t";
echo $year;
echo "<br>";
}
// What I am trying to do :
if (($m = $mois) && ($y = $year)){ // If the month and the year are the current month/year
$i = $id_cal; // I want to put the id refering to the current month/year (in my phpmyadmin table) into a new variable
echo "<br>"; // and echo this variable (or use it in other ways)
echo $i; // BUT what I am echoing is 24 representing the number of values in my array
} // How can I only get 7 ? (in this exemple, since we are the 7/2019)
Here is what I am getting in my localhost : echo
I really don't understand why am I not having 7.
Also, I tried this instead of my while:
$donnees= $reponse->fetch();
$mois = $donnees['mois'];
$year = $donnees['annee'];
$id_cal = $donnees['id_cal'];
// But in this cas I am having $i = 1, so it's the same problem.
Many thanks in advance for your response I am quite struggling with this.

Answer 1

It is because id_cal gets overwritten with the new value of id_cal in each iteration of your while statement.
To get the result you want, you could put the if inside the while statement...
while($donnees= $reponse->fetch()){
$mois = $donnees['mois'];
$year = $donnees['annee'];
$id_cal = $donnees['id_cal'];
echo $id_cal;
echo "\t";
echo $mois;
echo "\t";
echo $year;
echo "<br>";
if (($m == $mois) && ($y == $year)){
$my_var_to_use_elsewhere = $id_cal;
}
}
echo "<br>";
echo $my_var_to_use_elsewhere;