wpscholar

<?php

$post = get_post();
if ( current_user_can( 'edit_post_meta', $post->ID, '_email' )  && is_email( $_POST['email'] ) ) {
	update_post_meta( $post->ID, '_email', $_POST['email'] );
}

wpscholar

<?php

$volume_level = absint( $_POST['volume_level'] );
update_post_meta( get_the_ID(), 'volume_level', $volume_level );

wpscholar

<h1><?php esc_html_e( 'Blog', 'textdomain' ); ?></h1>

wpscholar

<?php

global $wpdb;
$wpdb->delete( $wpdb->postmeta, array( 'meta_id' => 101 ), array( '%d' ) );

wpscholar

<?php

global $wpdb;
$wpdb->update(
	$wpdb->posts,
	array( 'post_type' => 'new' ),
	array( 'post_type' => 'old' ),
	array( '%s' ),
	array( '%s' )
);

wpscholar

<?php 

global $wpdb;
$wpdb->insert(
	$wpdb->postmeta,
	array(
		'post_id'    => get_the_ID(),
		'meta_key'   => 'name',
		'meta_value' => 'John'
	),

wpscholar

<?php

global $wpdb;
$post = get_post();
$query = $wpdb->prepare(
	"SELECT * FROM {$wpdb->posts} WHERE post_type LIKE %s",
	'%' . like_escape( $post->post_type ) . '%'
);
$results = $wpdb->get_results( $query );

wpscholar

<?php

global $wpdb;
$query = $wpdb->prepare( 
  "SELECT * FROM {$wpdb->posts} WHERE post_type = %s", 
  $post->post_type 
);
$results = $wpdb->get_results( $query );

wpscholar

<script>
	var name = '<?php echo esc_js( $_POST['name'] ); ?>';
</script>

<a href="<?php echo esc_url( home_url( '/blog/' ) ); ?>" 
   onclick="<?php echo esc_js( 'alert("Welcome " + name);' ); ?>">
  <?php _e( 'Blog', 'textdomain' ) ?>
</a>

wpscholar

<label>
	<span><?php _e( 'Label', 'textdomain' ); ?></span>
	<textarea name="message"><?php echo esc_textarea( $_POST['message'] ); ?></textarea>
</label>