php to show array of $errors in javascript alert box - php

Question

does anyone know how to return error array in a javascript alert box? The code below that I have doesn't do the trick right. Browser returns "Cannot use [] for reading". When using $error without the bracket, browser only returns the word "Array" in the alert box but the error message is not showing. Any help?
echo '<script type="text/javascript">alert("Error: '.$errors[].'");</script>';
Updated to include the extent of my code:
$errors = [];
$target_dirRFP = ('accounts/' . $order_list . '/rfp/');
$file_nameRFP = $_FILES['FileToUploadRFP']['name'];
$file_sizeRFP = $_FILES['FileToUploadRFP']['size'];
$extentionRFP = pathinfo($file_nameRFP, PATHINFO_EXTENSION);
$tempRFP = ($_FILES["FileToUploadRFP"]["tmp_name"]);
$target_fileRFP = ($target_dirRFP . $file_nameRFP);
$valid_formatsRFP = array("pdf");
$target_dirPSA = ('accounts/' . $order_list . '/psa/');
$file_namePSA = $_FILES['FileToUploadPSA']['name'];
$file_sizePSA = $_FILES['FileToUploadPSA']['size'];
$extentionPSA = pathinfo($file_namePSA, PATHINFO_EXTENSION);
$tempPSA = ($_FILES["FileToUploadPSA"]["tmp_name"]);
$target_filePSA = ($target_dirPSA . $file_namePSA);
$valid_formatsPSA = array("pdf");
if(!empty($file_nameRFP)) {
if(in_array($extentionRFP, $valid_formatsRFP) === false) {
$errors[] = "The RFP you selected to upload is not allowed. Only PDF file is permitted.";
}
if (file_exists($target_fileRFP)) {
$errors[] = "Attached RFP: \"'.$file_nameRFP.'\" already exists.\nPlease select another file to upload.";
}
}
if(!empty($file_namePSA)) {
if(in_array($extentionPSA, $valid_formatsPSA) === false ) {
$errors[]="The PSA you selected to upload is not allowed. Only PDF file is permitted.";
}
if (file_exists($target_filePSA)) {
$errors[] = "Attached PSA: \"'.$file_namePSA.'\" already exists.\nPlease select another file to upload.";
}
}
if(empty($errors)==true) {
move_uploaded_file($tempRFP, $target_fileRFP);
move_uploaded_file($tempPSA, $target_filePSA);
$stmt = $DB_CON_C->prepare("INSERT INTO `".$order_list."`
SET first_name = '$first_name', last_name = '$last_name'");
$stmt->execute();
echo '<script type="text/javascript">alert("Submitted.");</script>';
} else {
echo '<script type="text/javascript">alert("Error: ' . implode("; ", $errors) . '");</script>';
}

Answer 1

Using implode() and entering new lines is most likely the best way.
Example:
<?php
$errors = [];
if( validateFails() ){
$errors[] = "some error found";
}
if( failAgain() ){
$errors[] = "some other error";
}
echo '<script>alert("'.implode("\\n", $errors).'");</script>';
UPDATE:
Another error lies on your error message string syntax. Take a look at this line:
$errors[] = "Attached PSA: \"'.$file_namePSA.'\" already exists.\nPlease select another file to upload.";
This should be re-written to:
$errors[] = "Attached PSA: $file_namePSA already exists.\\nPlease select another file to upload.";
As any variable inside double quotes "..." will be echoed out correctly. And a new line in the string should be \\n not \n.

Answer 2

You could transform your array in string with implode()
echo '<script type="text/javascript">alert("Error: ' . implode("; ", $errors) . '");</script>';

Answer 3

You'd have to create a single string representation of some sort. For example, you could "implode" the array using a delimiter. Something like:
echo '<script type="text/javascript">alert("Error: ' . implode(', ', $errors) . '");</script>';
This would just be a simple comma+space delimiter between all of the array elements. If you need something more complex or with more styling (in which case you probably don't want an alert() in the first place) then you could manually build any string you like from the contents of the array. You just need to output a string to the page, not an array directly.

Answer 4

Hopefully you will get exact output.Please try
alert(JSON.stringify($errors));