sanitize_post_field( string $field, mixed $value, int $post_id, string $context = ‘display’ ): mixed

Sanitizes a post field based on context.

Description

Possible context values are: ‘raw’, ‘edit’, ‘db’, ‘display’, ‘attribute’ and ‘js’. The ‘display’ context is used by default. ‘attribute’ and ‘js’ contexts are treated like ‘display’ when calling filters.

Parameters

$fieldstringrequired
The Post Object field name.
$valuemixedrequired
The Post Object value.
$post_idintrequired
Post ID.
$contextstringoptional
How to sanitize the field. Possible values are 'raw', 'edit', 'db', 'display', 'attribute' and 'js'. Default 'display'.

Default:'display'

Return

mixed Sanitized value.

More Information

Uses apply_filters():

  • Calls 'edit_{$field}' and '{$field_no_prefix}_edit_pre' passing $value and $post_id if $context is 'edit' and field name prefix is 'post_'.
  • Calls 'edit_post_{$field}' passing $value and $post_id if $context is 'db'.
  • Calls 'pre_{$field}' passing $value if $context is 'db' and field name prefix is 'post_'.
  • Calls '{$field}_pre' passing $value if $context is 'db' and field name prefix is not 'post_'.
  • Calls '{$field}' passing $value, $post_id and $context if $context is anything other than 'raw', 'edit' and 'db' and field name prefix is 'post_'.
  • Calls 'post_$field' passing $value if $context is anything other than 'raw', 'edit' and 'db' and field name prefix is not 'post_'.

Source

function sanitize_post_field( $field, $value, $post_id, $context = 'display' ) {
	$int_fields = array( 'ID', 'post_parent', 'menu_order' );
	if ( in_array( $field, $int_fields, true ) ) {
		$value = (int) $value;
	}

	// Fields which contain arrays of integers.
	$array_int_fields = array( 'ancestors' );
	if ( in_array( $field, $array_int_fields, true ) ) {
		$value = array_map( 'absint', $value );
		return $value;
	}

	if ( 'raw' === $context ) {
		return $value;
	}

	$prefixed = false;
	if ( str_contains( $field, 'post_' ) ) {
		$prefixed        = true;
		$field_no_prefix = str_replace( 'post_', '', $field );
	}

	if ( 'edit' === $context ) {
		$format_to_edit = array( 'post_content', 'post_excerpt', 'post_title', 'post_password' );

		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "edit_{$field}", $value, $post_id );

			/**
			 * Filters the value of a specific post field to edit.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers to
			 * the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value   Value of the post field.
			 * @param int   $post_id Post ID.
			 */
			$value = apply_filters( "{$field_no_prefix}_edit_pre", $value, $post_id );
		} else {
			$value = apply_filters( "edit_post_{$field}", $value, $post_id );
		}

		if ( in_array( $field, $format_to_edit, true ) ) {
			if ( 'post_content' === $field ) {
				$value = format_to_edit( $value, user_can_richedit() );
			} else {
				$value = format_to_edit( $value );
			}
		} else {
			$value = esc_attr( $value );
		}
	} elseif ( 'db' === $context ) {
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "pre_{$field}", $value );

			/**
			 * Filters the value of a specific field before saving.
			 *
			 * The dynamic portion of the hook name, `$field_no_prefix`, refers
			 * to the post field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field_no_prefix}_save_pre", $value );
		} else {
			$value = apply_filters( "pre_post_{$field}", $value );

			/**
			 * Filters the value of a specific post field before saving.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed $value Value of the post field.
			 */
			$value = apply_filters( "{$field}_pre", $value );
		}
	} else {

		// Use display filters by default.
		if ( $prefixed ) {

			/**
			 * Filters the value of a specific post field for display.
			 *
			 * The dynamic portion of the hook name, `$field`, refers to the post
			 * field name.
			 *
			 * @since 2.3.0
			 *
			 * @param mixed  $value   Value of the prefixed post field.
			 * @param int    $post_id Post ID.
			 * @param string $context Context for how to sanitize the field.
			 *                        Accepts 'raw', 'edit', 'db', 'display',
			 *                        'attribute', or 'js'. Default 'display'.
			 */
			$value = apply_filters( "{$field}", $value, $post_id, $context );
		} else {
			$value = apply_filters( "post_{$field}", $value, $post_id, $context );
		}

		if ( 'attribute' === $context ) {
			$value = esc_attr( $value );
		} elseif ( 'js' === $context ) {
			$value = esc_js( $value );
		}
	}

	// Restore the type for integer fields after esc_attr().
	if ( in_array( $field, $int_fields, true ) ) {
		$value = (int) $value;
	}

	return $value;
}

Hooks

apply_filters( “edit_{$field}”, mixed $value, int $post_id )

Filters the value of a specific post field to edit.

apply_filters( “pre_{$field}”, mixed $value )

Filters the value of a specific post field before saving.

apply_filters( “{$field_no_prefix}_edit_pre”, mixed $value, int $post_id )

Filters the value of a specific post field to edit.

apply_filters( “{$field_no_prefix}_save_pre”, mixed $value )

Filters the value of a specific field before saving.

apply_filters( “{$field}”, mixed $value, int $post_id, string $context )

Filters the value of a specific post field for display.

apply_filters( “{$field}_pre”, mixed $value )

Filters the value of a specific post field before saving.

Changelog

VersionDescription
4.4.0Like sanitize_post(), $context defaults to 'display'.
2.3.0Introduced.

User Contributed Notes

  1. Skip to note 5 content

    Sanitizing for Attributes
    Sanitize a post title for use as the value of a hidden form field:

    $post = get_post( 543 );
    $post_title = sanitize_post_field( 'post_title', $post->post_title, $post->ID, 'attribute' );
    echo '<input type="hidden" name="post-title" value="' . esc_attr( $post_title ) . '" />';
  2. Skip to note 6 content

    Here are the default post fields that you can get (case-sensitive):

      ID
      post_author
      post_date
      post_date_gmt
      post_content
      post_title
      post_excerpt
      post_status
      comment_status
      ping_status
      post_password
      post_name
      to_ping
      pinged
      post_modified
      post_modified_gmt
      post_content_filtered
      post_parent
      guid
      menu_order
      post_type
      post_mime_type
      comment_count
      filter

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