Check If $_Post Exists

Check if $_POST exists

if( isset($_POST['fromPerson']) )
{
     $fromPerson = '+from%3A'.$_POST['fromPerson'];
     echo $fromPerson;
}

Is there a way to check if a $_POST exists?

For a single key:

 if(isset($_POST['myKey'])) {
     echo "myKey exists"
 }

If you want to know if there is any POST data:

if(!empty($_POST)) {
    echo "We have POST data"
}

Php if($_POST) vs if(isset($_POST))

isset determine if a variable is set and is not NULL. $_POST will always be set and will always be an array.

Without isset you are just testing if the value is truthy. An empty array (which $_POST will be if you aren't posting any data) will not be truthy.

PHP Correctly checking if a post variable is empty

This link may be useful: https://www.virendrachandak.com/techtalk/php-isset-vs-empty-vs-is_null/

Use the empty function to check if a variable contents something:

<?php
if (isset($_POST['var']) && !empty($_POST['var'])) {
    echo $_POST['var'];
}
else {
    echo 'Please ensure you have entered your details';
}
?>

How to check if post title already exists?

The condition is backwards, get_page_by_title( $post_title ) === null means it doesn't exist, you just have to swap the then and else code blocks.

if ( get_page_by_title( $post_title ) === null ) {
  $post_id = wp_insert_post( $post );
  add_post_meta($post_id, 'portfolio-ids', $_POST['idsInput'], true);
} else {
  echo "Already exists!";
}

PHP If Statement if (!$_POST) - What does !$_POST mean?

The ! (not) logical operator returns true if the argument on its right-hand side is not true. It forces the argument to be evaluated as a boolean. In this case, when the $_POST array is evaluated as a boolean it will evaluate as true if it is not empty and false if it is. (See converting to boolean.)

if (!$_POST) { should be a safe way to detect whether or not anything is in $_POST if you want to do that. empty isn't necessary in that case because superglobals are always set, and since you aren't referring to a specific key, you don't need to worry about an undefined index notice.

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I think it's also worth mentioning that if the only point of the check is to see what type of request was sent, it is probably better to just check the request method directly, because !$_POST does not mean the request wasn't a post, since a post request can be empty.

Check exists post title

Try this code.

if( isset( $_POST['enable'] ) ) {

    $url        = 'api/url';
    $result     = file_get_contents( $url );
    $resultData = json_decode( $result );

    foreach ($resultData as  $job) {

        $post_title = sanitize_title( $job->JobTitle );
        $post_id    = post_exists( $post_title );

        if( !$post_id ){
            $data = array(
               'post_type'   => 'post',
               'post_title'  => $post_title,
               'post_status' => 'publish',
               'post_author' => $user_ID,
            );
            $post_id = wp_insert_post( $data );
        }else{
            //post title exist
        }

    }

}

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