Pushing value into the session array in php [duplicate] - php

Question

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Fatal error: [] operator not supported for strings
(9 answers)
Closed 6 years ago.
I have the following code where the user selects the value from a drop down. Everytime they submit, the ID should be pushed in the array.
<?php
$_SESSION["test"] = array();
$link = mysql_connect("localhost","root","");
mysql_select_db("dbsikkim",$link);
?>
<form name="form1" method="post" action="">
<?php
$sql=mysql_query("SELECT ID,DOC_DESC FROM gstn_document_type_master",$link);
echo "<select name='doc_type_code2'>";
if(mysql_num_rows($sql)){
while($row=mysql_fetch_array($sql)){
echo "<option value=".$row['ID'].">".$row['DOC_DESC']."</option>";
}
}
echo "</select>";
?>
<input type="submit" value="Submit" name="submit">
</form>
<?php
if(isset($_POST['submit']))
{
$_SESSION["test"][] = $_POST['doc_type_code2']; //ERROR IN THIS LINE
for ($i=0; $i < sizeof($_SESSION["test"]); $i++) {
echo $_SESSION["test"][$i]."<br>";
}
}
?>
Only the current value is pushed into the array and replaces the previous one. In simple words, it is working as a variable and not an array.

Answer 1

You most likely need to get your session variable initialized.
$_SESSION["test"] is not an array by default. You could try to do:
// If the session variable is not yet an array, initialize it
if (!is_array($_SESSION["test"])) {
$_SESSION["test"] = [];
}
$_SESSION["test"][] = $_POST['doc_type_code2'];
The first line assigns an array to your field.
The second one assigns a value to the array.
Please note, there are several things to improve in your code. In example, you could use PDO these days. Also you should not use "global". Also mixing PHP and HTML code like that might lead to software which is hard to maintain. I don't want to sound arrogant, but I highly recommend you the book "PHP The right way".