Maxxus PRO SPK-23 Especificaciones descargar pdf (Pagina 118)

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TABLE 3.1 Allowed extract_types for extract()

Type Meaning

EXTR_OVERWRITE Overwrites the existing variable when a collision occurs.

EXTR_SKIP Skips an element when a collision occurs.

EXTR_PREFIX_SAME Creates a variable named $prefix_key when a collision

occurs. You must supply prefix.

EXTR_PREFIX_ALL Prefixes all variable names with prefix. You must supply

prefix.

The two most useful options are the default (

EXTR_OVERWRITE) and EXTR_PREFIX_ALL. The

other two options might be useful occasionally when you know that a particular collision will

occur and want that key skipped or prefixed. A simple example using EXTR_PREFIX_ALL fol-

lows. You can see that the variables created are called prefix-underscore-keyname.

$array = array( “key1” => “value1”, “key2” => “value2”, “key3” => “value3”);

extract($array, EXTR_PREFIX_ALL, “myPrefix”);

echo “$myPrefix_key1 $myPrefix_key2 $myPrefix_key3”;

This code will again produce the output: value1 value2 value3.

Note that for extract() to extract an element, that element’s key must be a valid variable

name, which means that keys starting with numbers or including spaces will be skipped.

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