# How To's
## Iterate an associative array (map)
```php
foreach ($map as $key => $value) {
    echo "{$key} => {$value} ";
    print_r($arr);
}
```

## Use a lambda to map an array of objects into a string
```php
$getVideoUrl = function($video) : string {
  return "<a href='".$video->video_url."'><img src='".$video->thumbnail_url."'/></a>";
};
...
$videoUrls = $listing->videos != null ? implode(",", array_map($getVideoUrl, $listing->videos)) : "";
```

## Getting request parameter and setting values

* http://max/php-manual/reserved.variables.html
* `$_SERVER`
  * http://max/php-manual/reserved.variables.server.html
* `$_GET`
  * http://max/php-manual/reserved.variables.get.html (technically ALL params on the URL regardless of HTTP verb)
* `$_POST`
  * http://max/php-manual/reserved.variables.post.html
* `$_FILES`
  * http://max/php-manual/reserved.variables.files.html
* `$_REQUEST`
  * http://max/php-manual/reserved.variables.request.html

```
// param value is null if missing
$getParam         = $_GET["paramName"];
$postParam        = $_POST["paramName"];
$anyRequestParam  = $_REQUEST["paramName"];
```

# String Formatting
## Number-to-string Formatting

source - https://www.php.net/manual/en/function.number-format.phphttps://www.php.net/manual/en/function.sprintf.php

`$nextSkuOrdinal = sprintf("%03d", $row['nextSkuOrdinal']);`