_list_meta_row( array $entry, int $count ): string

Compatibility

Present in every tracked release (6.7.7 to 7.1.0), and compiles on PHP 7.4 through 8.6-dev.

Parameters

$entryarray

An array of meta data keyed on 'meta_key' and 'meta_value'.

$countint

Reference to the row number.

Return value

string

A single row of public meta data.

Performance profile

How much work a call to _list_meta_row() does, and what it touches: the algorithmic scaling, the Zend instruction count per call across PHP versions, the hooks it hands control to, and the core code that calls it. Measured from the compiled opcodes, not a stopwatch, so every number is identical on any machine running the same PHP version, and every function in core is ranked by cost.

Cost class

Moderate

Reads stored settings via get_option(), cached per request but not free on a cold cache.

Scaling

Constant

No loop in the body: the same number of instructions runs whatever you pass in.

Instructions

11–160

Executed per call on PHP 8.5, depending on the branch taken. The body compiles to 163.

Plugin surface

None

Nothing here hands control to plugin code.

Called by

2

2 places in core call this, so the cost is paid more often than your own code shows.

What it touches

• serializeserialisationmaybe_unserialize()called directly
• hookthird-party callbacksapply_filters()one call below _list_meta_row()
• optionoption read or writeget_option()one call below _list_meta_row()

Further down the call graph this can also reach cache, transient and query. Those are the worst case, several calls deep and usually down an error path, not what a normal call pays.

What one call costs · 7 distinct outcomes

One number would be a lie: the work depends on which branch runs. These are every distinct cost _list_meta_row() can have, taken from its control-flow graph on PHP 8.5.

Uses · 10

• is_protected_meta()Determines whether a meta key is considered protected.
• wp_create_nonce()Creates a cryptographic token tied to a specific action, user, user session, and window of time.
• is_serialized()Checks value to find if it was serialized.
• is_serialized_string()Checks whether serialized data is of string type.
• maybe_unserialize()Unserializes data only if it was serialized.
• esc_attr()Escaping for HTML attributes.
• esc_textarea()Escaping for textarea values.
• __()Retrieves the translation of $text.
• get_submit_button()Returns a submit button, with provided text and appropriate class.
• wp_nonce_field()Retrieves or display nonce hidden field for forms.

Used by · 2

• list_meta()Outputs a post's public meta data in the Custom Fields meta box.
• wp_ajax_add_meta()Handles adding meta via AJAX.

Source code

View on Trac ↗View on GitHub ↗

631function _list_meta_row( $entry, &$count ) {632	static $update_nonce = '';633 634	if ( is_protected_meta( $entry['meta_key'], 'post' ) ) {635		return '';636	}637 638	if ( ! $update_nonce ) {639		$update_nonce = wp_create_nonce( 'add-meta' );640	}641 642	$r = '';643	++$count;644 645	if ( is_serialized( $entry['meta_value'] ) ) {646		if ( is_serialized_string( $entry['meta_value'] ) ) {647			// This is a serialized string, so we should display it.648			$entry['meta_value'] = maybe_unserialize( $entry['meta_value'] );649		} else {650			// This is a serialized array/object so we should NOT display it.651			--$count;652			return '';653		}654	}655 656	$entry['meta_key']   = esc_attr( $entry['meta_key'] );657	$entry['meta_value'] = esc_textarea( $entry['meta_value'] ); // Using a <textarea />.658	$entry['meta_id']    = (int) $entry['meta_id'];659 660	$delete_nonce = wp_create_nonce( 'delete-meta_' . $entry['meta_id'] );661 662	$r .= "\n\t<tr id='meta-{$entry['meta_id']}'>";663	$r .= "\n\t\t<td class='left'><label class='screen-reader-text' for='meta-{$entry['meta_id']}-key'>" .664		/* translators: Hidden accessibility text. */665		__( 'Key' ) .666	"</label><input name='meta[{$entry['meta_id']}][key]' id='meta-{$entry['meta_id']}-key' type='text' size='20' value='{$entry['meta_key']}' />";667 668	$r .= "\n\t\t<div class='submit'>";669	$r .= get_submit_button( __( 'Delete' ), 'deletemeta small', "deletemeta[{$entry['meta_id']}]", false, array( 'data-wp-lists' => "delete:the-list:meta-{$entry['meta_id']}::_ajax_nonce=$delete_nonce" ) );670	$r .= "\n\t\t";671	$r .= get_submit_button( __( 'Update' ), 'updatemeta small', "meta-{$entry['meta_id']}-submit", false, array( 'data-wp-lists' => "add:the-list:meta-{$entry['meta_id']}::_ajax_nonce-add-meta=$update_nonce" ) );672	$r .= '</div>';673	$r .= wp_nonce_field( 'change-meta', '_ajax_nonce', false, false );674	$r .= '</td>';675 676	$r .= "\n\t\t<td><label class='screen-reader-text' for='meta-{$entry['meta_id']}-value'>" .677		/* translators: Hidden accessibility text. */678		__( 'Value' ) .679	"</label><textarea name='meta[{$entry['meta_id']}][value]' id='meta-{$entry['meta_id']}-value' rows='2' cols='30'>{$entry['meta_value']}</textarea></td>\n\t</tr>";680	return $r;681}

Changelog

Introduced in 2.5.0. Unchanged from 6.7.7 through 7.1.0.

1. 6.7.7
2. 6.8.8
3. 6.9.7
4. 7.0.4
5. 7.1.0

Signature, return type and hooks compared across 5 parsed releases.

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