(Relates to: VueJS 2.x)
I received the following error:
[Vue warn]: v-bind without argument expects an Object or Array value found in ---> <Anonymous> <Root>
The error was caused by the following line of code:
<input type="text" class="form-control" id="Title" v-bind="post.Title">
My mistake:
I used v-bind but I should have used v-model.
The correct code is:
<input type="text" class="form-control" id="Title" v-model="post.Title">
Getting started with MongoDB on Windows and developing it with PHP turned out to be quite easy.
You can create a MongoDB database “in the cloud” for free with MongoDB’s Atlas platform – https://cloud.mongodb.com. No credit card required and you’re up and running in under 10 minutes (most of that time is waiting) after filling in a simple form fill and a few button clicks.
Next you need to setup XAMPP if haven’t already. Follow my post Setting up XAMPP for WordPress Development on Windows for details on how to do that. That gives you Apache and PHP running capability.
Finally you need to install MongoDB drivers for PHP under XAMPP. I use https://www.configserverfirewall.com/mongodb/install-mongodb-php-driver-ubuntu-windows/#install-php-mongodb-driver-on-windows to figure that out. The steps are:
If you run MongoDB locally you’ll have PHP code something link this to establish a connection:
<?php
$connection = new MongoDB\Driver\Manager("mongodb://localhost:27017");
var_dump($connection);
?>
If you connect Atlas use a connection string something like:
new MongoDB\Driver\Manager("mongodb+srv://<db-username>:<db-password>@azure-westus-1-fzl9p.azure.mongodb.net/test?retryWrites=true&w=majority");
Where <db-username> and <db-password> are the username and password you created in Atlas.
“azure-westus-1-fzl9p.azure.mongodb.net” is for my the specific Mongo instance – it will be different for you.
The connection string between the double-quotes is the same as was generated when you go into your collection, select the “Connect” button and follow the prompts.
I had situation with a JavaScript (.js) file seeming to load OK but in reality it was a misdirect.
Using Chrome, I inspected the Network tab in Developer Tools and couldn’t see an error with the file load. But on closer inspection, I noticed the Status was a “302” and the Type was “text/html” as follows (I was expecting a “200” Status and “script” mime Type).
It was luck that I found the answer:
I was loading the JavaScript file using the path “/inc/assets/js/vueks/vue-2.6.10.js”.
But I had a spelling mistake in the path. It should have been: “/inc/assets/js/vuejs/vue-2.6.10.js”.
I changed “vueks” to “vuejs” and the script loaded successfully.
The strange thing is the incorrect path didn’t give me a “404” (Not Found) response. Instead I received a “302 Found”, where clearly the file was not found.
My guess is I was loading it in a WordPress site, and while the file was not found I do have code internally to redirect to a “/not-found” page that may have returned some form of response (even though it contained no content). That or some headers were returned which confused Chrome.
(I haven’t tried to replicate this other browsers yet.)
I was trying to submit data from a web page to a back-end API in PHP using jQuery’s AJAX (ie. $.ajax()).
But the $_POST variable in PHP didn’t contain the values I was posting.
The problem is I was encoding the POST body data the wrong way in JavaScript.
I was using JSON.stringify(data), where “data” is a JavaScript object or array.
What I needed to do what manually create a string of key1=value1&key2=value2&keyN=valueN pairs.
Example Code from my submit function:
//sendData = JSON.stringify(data); //<-- This doesn't work ...
// ... but this does.
sendData = "";
for (var key in data)
{
if (sendData != "") sendData = sendData + "&";
sendData = sendData + key + "=" + data[key];
}
var ajaxRequest = {
url: url,
type: "POST",
data: sendData,
dataType: dataType,
success: function(data, textStatus, jqXHR) { successCallback(data, textStatus, jqXHR ); },
error: function(jqXHR, textStatus, errorThrown) { errorCallback(data, textStatus, errorThrown); }
};
$.ajax(ajaxRequest);
Search “$_POST empty from jquery”: https://duckduckgo.com/?q=%24_POST+empty+from+jquery&atb=v147-1&ia=web
https://stackoverflow.com/questions/1650516/jquery-ajax-method-post-but-post-empty
https://stackoverflow.com/questions/16360008/jquery-post-post-empty
https://stackoverflow.com/questions/1650516/jquery-ajax-method-post-but-post-empty/49948834#49948834
I use the Codeanywhere online IDE for my WordPress development. Sometimes I screw up something I’m testing (usually when I try to manipulate the filesystem with PHP) and need to reset my local branch to the last clean commit I sent to remote.
(Note that I said “remote”. I don’t trust local commits. I continually push to remote to have a safe restore point, especially if I need to do a full delete of my local branch. Yes, it has happened more than once.)
Occasionally I find folder permissions screw up as well and I need to reset via the bash command line.
The following commands are what I always come back to.
Note: The “$” in the command below represent the command-line prompt. The actual commands follow it.
Reset a local branch to the the last remote commit of the branch
$ git reset --hard HEAD
Clean up any uncommitted folders/files that the reset didn’t remove
$ git clean -f -d
Set full permission recursively on a folder and all files/sub-folders
Change directory (cd) to the parent folder of the folder you want to set permission on.
$ sudo chmod -R 777 vylesk-module-z1
Recursively delete a folder and all files/sub-folders
Change directory (cd) to the parent folder of the folder you want to delete.
$ rm -rf vylesk-module-z1
Note: The “f” means you are not prompted to delete each file/folder.
While working with zip files in WordPress (I’m setting up my own update server and package update process), I manually created a zip file in using 7zip in Windows (my primary operating system) and extracted it via PHP in a Codeanywhere Ubuntu workspace.
The problem was the zip file was created containing Windows paths, so I ended up file with a file name “vylesk-test-plugin\vylesk-test-plugin.txt” and directory name “D:\Temp\php\vylesk-test-plugin\vylesk-test-plugin.1.1\vylesk-test-plugin\“.
Notice the backslashes and “D:” drive path.
Removing the file and directory was a problem.
Attempting to perform a simple rm and rm -rf resulted in:
rm: cannot remove './vylesk-test-plugin\vylesk-test-plugin.txt': Permission denied rm: cannot remove '_temp/vylesk-test-plugin.1.1/D:\Temp\php\vylesk-test-plugin\vylesk-test-plugin.1.1\vylesk-test-plugin\': Permission denied
I tried changing file permissions using chmod and that also resulted in:
chmod: changing permissions of 'vylesk-test-plugin.1.1/D:\Temp\php\vylesk-test-plugin\vylesk-test-plugin.1.1\vylesk-test-plugin\': Operation not permitted chmod: changing permissions of 'vylesk-test-plugin.1.1/vylesk-test-plugin\vylesk-test-plugin.txt': Operation not permitted
The solution turned out to be very simple. I just needed to prefix the command with sudo.
So I ended up with:
sudo rm vylesk-test-plugin\\vylesk-test-plugin.txt sudo rm -rf 'D:\Temp\php\vylesk-test-plugin\vylesk-test-plugin.1.1\vylesk-test-plugin\'
The file and directory then deleted successfully (and I didn’t need an su password, which I don’t know anywhere because it’s in a virtual environment I don’t control).
Note 2 other elements of the commands:
I just received the following PHP error.
Fatal error: Can’t use function return value in write context in /path/to/file.php on line 595
And I had no fucking idea what the problem was. I had a “sense” of it, but I didn’t understand the “in write context” part (that’s what happens when you get geeks to write error messages).
The line causing the error was this:
if (strtolower($append_value) = strtolower($base_value))
It’s one of those classic programmer errors that is in your face but is easily lost in the code.
Here’s the fixed line
if (strtolower($append_value) == strtolower($base_value))
Yeap – I missed an equals sign to make it an equality expression rather than an assignment (i.e. “=” changed to “==”).
Interestingly, this error was thrown without actually being executed. It must have been while the script was being parsed. I’m using PHP 7.3 in WordPress in the Codeanywhere online IDE.
Status: Draft (31 May 2019)
This is a work in progress. I want to record my working as I go.
I need to zip a folder structure – ultimately, theme and plug-in folder in WordPress – using PHP.
I’m currently developing and testing on a Windows 10 PC. Ultimately it will need to work in Linux (Ubuntu), but the first step is to it working in Windows.
I started with solutions from https://gist.github.com/MarvinMenzerath/4185113/72db1670454bd707b9d761a9d5e83c54da2052ac and https://stackoverflow.com/questions/1334613/how-to-recursively-zip-a-directory-in-php but the zip file was being created, however, not files were added.
I realised the problem was the relative path for folders/files within the zip. My solution below is a modification of the referenced solutions, where I strip the source path from the fill file path of each folder and file to give the relative path to the source.
So far this works in Windows, next step is to test in Linux. I’m actively working the problem so stay tuned.
I created a file “D:\Temp\php\test_zip.php” with the code below.
I execute with the following command (I have XAMPP installed with includes PHP): “D:\Temp\php>D:\xampp\php\php.exe test_zip.php”.
(Aide: I used https://www.freeformatter.com/html-escape.html to convert raw PHP code to something I can past in between <pre> tags in the Classic WorPress content editor).
<?php
// Make sure the script can handle large folders/files
ini_set('max_execution_time', 600);
ini_set('memory_limit','1024M');
// Start the backup!
Zip('D:\\Temp\\php\\Source\\', './compressed.zip');
Zip('D:\\Temp\\hildas_prod_logs\\', 'D:\\Temp\\php\\backup-test.zip');
testOne('D:\\Temp\\php\\Source\\debug.log', 'D:\\Temp\\php\\compressed_testOne.zip');
echo "Finished" . "\n";
// A quick, reduced test.
// This works in Windows.
function testOne($source, $zipTo)
{
$zip = new ZipArchive;
if (file_exists($source) === false)
{
echo "Sourece does not exist" . "\n";
return;
}
if ($zip->open($zipTo, ZIPARCHIVE::CREATE) === true)
{
$zip->addFile($source, 'source\newname.txt');
$zip->close();
echo "OK" . "\n";
}
else
{
echo "FAILED" . "\n";
}
}
// This works in Windows.
// Source and inspiration: https://gist.github.com/MarvinMenzerath/4185113/72db1670454bd707b9d761a9d5e83c54da2052ac - Marvin Menzerath. (http://menzerath.eu)
// Additional source and inspiration: https://stackoverflow.com/questions/1334613/how-to-recursively-zip-a-directory-in-php
function Zip($source, $destination)
{
if (!extension_loaded('zip'))
{
echo "Zip extension not loaded\n";
return false;
}
if (!file_exists($source))
{
echo "Source not found:" . $source . "\n";
return false;
}
$zip = new ZipArchive();
if (!$zip->open($destination, ZIPARCHIVE::CREATE))
{
echo "Zip not created or opened\n";
return false;
}
$raw_source = $source;
$source = str_replace('\\', '/', realpath($source));
echo "Raw source: " . $raw_source . "\n";
echo "Clean source: " . $source . "\n";
if (is_dir($source) === true)
{
$files = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($source), RecursiveIteratorIterator::SELF_FIRST);
$sourceWithSeparator = $source . DIRECTORY_SEPARATOR;
foreach ($files as $file)
{
$file = str_replace('\\', '/', $file);
// Ignore "." and ".." folders
if( in_array(substr($file, strrpos($file, '/')+1), array('.', '..')) )
continue;
$file = realpath($file);
if (is_dir($file) === true)
{
$dir_path = str_replace($sourceWithSeparator, '', $file . DIRECTORY_SEPARATOR);
echo "Directory: " . $file . " (Path: " . $dir_path . ")\n";
//$zip->addEmptyDir(str_replace($source . '/', '', $file . '/'));
$zip->addEmptyDir($dir_path);
}
else if (is_file($file) === true)
{
$zip_relative_path = str_replace($sourceWithSeparator, '', $file);
$zip_relative_path = remove_from_start($zip_relative_path, $raw_source);
echo "File: " . $file . " (Path: " . $zip_relative_path . ")\n";
//$zip->addFromString(str_replace($source . '/', '', $file), file_get_contents($file));
//$zip->addFile($file, str_replace($source . '/', '', $file));
$zip->addFile($file, $zip_relative_path);
}
}
}
else if (is_file($source) === true)
{
$zip->addFromString(basename($source), file_get_contents($source));
}
return $zip->close();
}
function remove_from_start($full_string, $prefix)
{
if (substr($full_string, 0, strlen($prefix)) == $prefix)
{
$full_string = substr($full_string, strlen($prefix));
}
return $full_string;
}
?>
Here’s the code for a simple WordPress shortcode to conditionally display content within pages based on supplied usernames or roles.
Display to a specified user:
Display to a specified role:
Display to both a user and a role:
Display to multiple roles (comma separated list. “username” works the same):
It’s in a GitHub gist at https://gist.github.com/vylesk/64ca3e6d3da77fb853ca7af181165e6b and below:
<?php
/**
* Plugin Name: "Show If" Shortcode
* Plugin URI: https://jsnelders.com/
* Description: Shortcode to conditionally display content if the user is in a specified role or has a specified username.
* Author: Jason Snelders
* Author URI: http://jsnelders.com
* Version: 190529.1
**/
namespace JasonSnelders\Shortcodes;
/*
* Show the content only if the current user is one of the specified username(s) or in one ofthe role(s).
*
* Attributes:
* role: comma separated list of allowed roles to view the content.
* username: comma separated list of allowed usernames to view the content.
*
* Attrubtes combine as an OR expressess - content is displayed if they user is in the "role" list OR the "username" list.
*/
add_shortcode('show_if', 'JasonSnelders\Shortcodes\show_if_handler');
function show_if_handler($atts = [], $content = null)
{
// Get supplied shortcode attributes.
$show_if_role = "";
$show_if_username = "";
if(isset($atts["role"])) $show_if_role = $atts["role"];
if(isset($atts["username"])) $show_if_username = $atts["username"];
$show_if_role = explode(',', $show_if_role);
$show_if_username = explode(',', $show_if_username);
// Get the current user.
$wp_user = \wp_get_current_user();
$wp_user_roles = $wp_user->roles;
$wp_user_username = $wp_user->user_login;
// Check if current user can view content/
$show_to_user = false;
foreach ($wp_user_roles as $role_slug)
{
if ($role_slug != "" && in_array_case_insensitive($atts, $role_slug))
{
$show_to_user = true;
break;
}
}
if ($show_to_user == false)
{
foreach ($show_if_username as $show_username)
{
if ($show_username != "" && strtolower($show_username) == strtolower($wp_user_username))
{
$show_to_user = true;
break;
}
}
}
ob_start();
if ($show_to_user == true)
{
// Show the content
$content = do_shortcode($content);
echo $content;
}
else
{
// Hide the content
echo "";
}
return ob_get_clean();
}
/*
* Case-insensitive check if a value is in the array.
* (Source: https://gist.github.com/sepehr/6351397)
*/
function in_array_case_insensitive($array, $check_value)
{
return in_array(strtolower($check_value), array_map('strtolower', $array));
}
?>
Updated: 27 May 2019 (Added “Troubleshooting” at the end).
A quick guide to setting up a WordPress development environment in the Codeanywhere online IDE (https://codeanywhere.com/) and linking to an existing GitHub (or other) source control repository (which I assume also contains the WordPress core code).
It’s not entirely obvious so hopefully this helps.
I’m assuming
Step 1: In your Codeanywhere Editor page, right-click “Connections” in the left-hand pane and select “New Connection”.
Step 2: A “Connection Wizard” dialogue will open. Select “GitHub” (or your relevant source) from the left-side list. A list of repositories will be displayed in the dialogue.
Step 3: Select the repository you want to use. Then un-tick the “Autodetect stack” option below the list (this is what I missed the first time – autodetect doesn’t actually work that well).
Step 4: In the next step of the “Connection Wizard” dialogue, scroll down (or search) until you see a “PHP” stack containing “PHP Develppment Stack with Apache, PHP, MySQL, phpMyAdmin and Composer installed”. You can select either Ubuntu or Centos (I work with Ubuntu).
Then select “Create”.
That’s it!
A new LAMP environment connected to your GitHub repository should soon available and showing.
Note: I’m new to Codeanywhere (13 May 2019). I’m switching to this IDE from the soon-to-be-closed-and-fucked-by-AWS Cloud9 (c9.io) as my primary IDE for WordPress and so far I’ve only followed the above steps and managed to work [so far successfully] in the SSH terminal. I’m not yet sure about the lifecycle of the Codeanywhere environments yet, or how to run multiple in the editor.
If you have trouble updating WordPress core or plug-ins within your account and receive a message like this:
To perform the requested action, WordPress needs to access your web server.
Please enter your FTP credentials to proceed.
If you do not remember your credentials, you should contact your web host.
Then add the following line to to wp-config to allow updates:
define( 'FS_METHOD', 'direct' );