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Readline Functions
PHP Manual

# readline_completion_function

Registers a completion function

### Description

bool readline_completion_function ( callable `$function` )

This function registers a completion function. This is the same kind of functionality you'd get if you hit your tab key while using Bash.

### Parameters

`function`

  You must supply the name of an existing function which accepts a partial command line and returns an array of possible matches.

### Return Values

Returns `TRUE` on success or `FALSE` on failure.