My php code loops and doesn't explore my database [duplicate] - php

Question

This question already has answers here:
The 3 different equals
(5 answers)
Closed 1 year ago.
Hello I'm currently trying to create a page based on a database under mysql that would update itself for a client. However what I'm trying to do loops and returns the first value of the database each time and indefinetely when I want it to go on to another object in the database. Here is the code, I'm a beginner so the error might be flagrant, thanks for the help.
<?php
try
{
$db = new PDO('mysql:host=localhost;dbname=labase', 'root' ,'');
$db->exec(" SET CHARACTER SET utf8 ");
$db->setAttribute(PDO::ATTR_CASE, PDO::CASE_LOWER);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(Exception $e){
echo'une erreur est survenue';
die();
}
for ($i = 1; $i < 10; $i++) {
if ($i=1){
$select = $db->prepare("Select profession from contact where affiliation='nord' group by profession"); // je récupère les professions de la bdd
$select->execute();
}
$data = $select->fetch(PDO::FETCH_OBJ);
$profess=$data->profession; // je prends la prochaine profession
$selectionner = $db->prepare("Select nomcontact, count(*) as nbrcontact from contact where affiliation='nord' and profession='$profess'"); // je prends les contacts qui ont cette profession ainsi que leur nombre
$selectionner->execute();
$prendre = $selectionner->fetch(PDO::FETCH_OBJ);
$nbrcontact=$prendre->nbrcontact;// je récupère leur nombre
echo $profess;
echo $nbrcontact;
}
?>

Answer 1

I am not a PHP expert and never use PDO, but in Msqli, there is a fetch_array() to get multiple result (instead of fetch for single result), maybe in PDO you have a fetch_array too. Then, you can loop on the result array
Something like that (using msqli)
$sql = "SELECT... FROM ..";
$result = $link->query($sql);
while($row =mysqli_fetch_array($result))
{
}

Answer 2

if ($i=1) { // here is should be == or ===

Answer 3

You're causing an infinite loop by declaring $i=1
<?php
try
{
$db = new PDO('mysql:host=localhost;dbname=labase', 'root' ,'');
$db->exec(" SET CHARACTER SET utf8 ");
$db->setAttribute(PDO::ATTR_CASE, PDO::CASE_LOWER);
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(Exception $e){
echo'une erreur est survenue';
die();
}
for ($i = 1; $i < 10; $i++) {
if ($i == 1){ // added code
$select = $db->prepare("Select profession from contact where affiliation='nord' group by profession"); // je récupère les professions de la bdd
$select->execute();
}
$data = $select->fetch(PDO::FETCH_OBJ);
$profess=$data->profession; // je prends la prochaine profession
$selectionner = $db->prepare("Select nomcontact, count(*) as nbrcontact from contact where affiliation='nord' and profession='$profess'"); // je prends les contacts qui ont cette profession ainsi que leur nombre
$selectionner->execute();
$prendre = $selectionner->fetch(PDO::FETCH_OBJ);
$nbrcontact=$prendre->nbrcontact;// je récupère leur nombre
echo $profess;
echo $nbrcontact;
}
?>
Use == for comparison