Be aware that if you are trying to foreach the associative array returned by mysql_fetch_array() with MYSQL_ASSOC or mysql_fetch_assoc(), you have to ensure the return value that is used in foreach structure is exactly a array rather than a FALSE value.
Or you might encounter the warning below:
Warning: Invalid argument supplied for foreach()
Here is an example (assume that $result have already stored the return value from mysql_query()):
If you have some block of code like:
<?php
// Printing results in HTML
echo "<table>\n";
while ($line = mysql_fetch_array($result, MYSQL_ASSOC)) {
echo "\t<tr>\n";
foreach ($line as $col_value) {
echo "\t\t<td>$col_value</td>\n";
}
echo "\t</tr>\n";
}
echo "</table>\n";
?>
If this is the case, you should use the code below instead:
<?php
// Check ahead, before using it
if (mysql_num_rows($result) > 0) {
// Printing results in HTML
echo "<table>\n";
while ($line = mysql_fetch_array($result, MYSQL_ASSOC)) {
echo "\t<tr>\n";
foreach ($line as $col_value) {
echo "\t\t<td>$col_value</td>\n";
}
echo "\t</tr>\n";
}
echo "</table>\n";
}
?>
Exemple avec l'extension MySQL
Cet exemple simple montre comment se connecter, exécuter une requête, lire les informations obtenues et se déconnecter d'une base de données MySQL.
Exemple #1 Exemple de présentation de l'extension MySQL
<?php
// Connexion et sélection de la base
$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password')
or die('Impossible de se connecter : ' . mysql_error());
echo 'Connected successfully';
mysql_select_db('my_database') or die('Impossible de sélectionner la base de données');
// Exécution des requêtes SQL
$query = 'SELECT * FROM my_table';
$result = mysql_query($query) or die('Échec de la requête : ' . mysql_error());
// Affichage des résultats en HTML
echo "<table>\n";
while ($line = mysql_fetch_array($result, MYSQL_ASSOC)) {
echo "\t<tr>\n";
foreach ($line as $col_value) {
echo "\t\t<td>$col_value</td>\n";
}
echo "\t</tr>\n";
}
echo "</table>\n";
// Libération des résultats
mysql_free_result($result);
// Fermeture de la connexion
mysql_close($link);
?>
add a note
User Contributed Notes 1 note
zjrwjzzz at 163 dot com ¶
9 years ago
