Introduction
The readline functions implement an interface to the GNU Readline library. These are functions that provide editable command lines. An example being the way Bash allows you to use the arrow keys to insert characters or scroll through command history. Because of the interactive nature of this library, it will be of little use for writing Web applications, but may be useful when writing scripts used from a command line.
As of PHP 7.1.0 this extension is supported on Windows.
Caution
The readline extension is not thread-safe! Thus, the usage of it with any true thread safe SAPI (like Apache mod_winnt) is strongly discouraged.
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