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";
}
?>
Exemplu de ansamblu pentru extensia MySQL
Acest exemplu simplu demonstrează connectarea, executarea unei interpelări, afișarea rândurilor rezultante și deconectarea de la o bază de date MySQL.
Example #1 Exemplu general de utilizare a extensiei MySQL
<?php
// Connectarea, selectarea bazei de date
$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password')
or die('Could not connect: ' . mysql_error());
echo 'Connected successfully';
mysql_select_db('my_database') or die('Could not select database');
// Efectuarea interpelării SQL
$query = 'SELECT * FROM my_table';
$result = mysql_query($query) or die('Query failed: ' . mysql_error());
// Afișarea rezultatelor în 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";
// Eliberarea setului de rezultate
mysql_free_result($result);
// Închiderea conexiunii
mysql_close($link);
?>
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zjrwjzzz at 163 dot com ¶
9 years ago
