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The DOMProcessingInstruction class

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This represents a processing instruction (PI) node. These are meant to indicate data areas meant for processing by specific applications.

This represents a processing instruction (PI) node. These are meant to indicate data areas meant for processing by specific applications.

class DOMProcessingInstruction extends DOMNode { }

target: A string representing to what application the data is intended for.
data: Application-specific data.

Domprocessinginstruction

In this section

Creates a new DOMProcessingInstruction object

Source: reference/dom/domprocessinginstruction.xml · from the official PHP manual (php/doc-en)