# pg_escape_identifier

(PHP 5 >= 5.4.4, PHP 7, PHP 8)

pg_escape_identifier — Escape a identifier for insertion into a text field

### Descripción

pg_escape_identifier(PgSql\Connection `$connection` = ?, string `$data`): string

pg_escape_identifier() escapes a identifier (e.g. table, field names) for querying the database. It returns an escaped identifier string for PostgreSQL server. pg_escape_identifier() adds double quotes before and after data. Users should not add double quotes. Use of this function is recommended for identifier parameters in query. For SQL literals (i.e. parameters except bytea), pg_escape_literal() or pg_escape_string() must be used. For bytea type fields, pg_escape_bytea() must be used instead.

> Nota:

> This function has internal escape code and can also be used with PostgreSQL 8.4 or less.

### Parámetros

`connection`

  An PgSql\Connection instance. When `connection` is unspecified, the default connection is used. The default connection is the last connection made by pg_connect() or pg_pconnect().

  Advertencia

  As of PHP 8.1.0, using the default connection is deprecated.

`data`

  A string containing text to be escaped.

### Valores devueltos

A string containing the escaped data.

### Historial de cambios

Versión | Descripción
--- | ---
8.1.0 | The `connection` parameter expects an PgSql\Connection instance now; previously, a recurso was expected.

### Ejemplos

Ejemplo #1 pg_escape_identifier() example

`<?php
// Connect to the database
$dbconn = pg_connect('dbname=foo');
// Escape the table name data
$escaped = pg_escape_identifier($table_name);
// Select rows from $table_name
pg_query("SELECT * FROM {$escaped};");
?>`

### Ver también

- pg_escape_literal() - Escape a literal for insertion into a text field
- pg_escape_bytea() - Escapar un string para insertarlo en un campo bytea
- pg_escape_string() - Escape a string for query