readline_callback_handler_install
(PHP 5 >= 5.1.0RC1)
readline_callback_handler_install -- Initializes the readline callback interface and terminal, prints the prompt and returns immediately
说明
bool
readline_callback_handler_install
( string prompt, callback callback )
Sets up a readline callback interface then prints
prompt
and immediately returns. The
callback
function takes one parameter; the user
input returned. Calling this function twice without removing the previous
callback interface will automatically and conveniently overwrite the old
interface.
The callback feature is useful when combined with
stream_select()
as it allows interleaving of IO and
user input, unlike
readline()
.
返回值
如果成功则返回
TRUE
，失败则返回
FALSE
。
范例
例子 1. Readline Callback Interface Example
<?php
function
rl_callback
(
$ret
)
{
global
$c
,
$prompting
;
echo
"You entered: $ret
\n
"
;
$c
++;
if (
$c
>
10
) {
$prompting
=
false
;
readline_callback_handler_remove
();
} else {
readline_callback_handler_install
(
"
[
$c
]
Enter something: "
,
'rl_callback'
);
}
}
$c
=
1
;
$prompting
=
true
;
readline_callback_handler_install
(
"
[
$c
]
Enter something: "
,
'rl_callback'
);
while (
$prompting
) {
$n
=
stream_select
(
$r
= array(
STDIN
),
$w
=
null
,
$e
=
null
,
null
);
if (
$n
&&
in_array
(
STDIN
,
$r
)) {
// read a character, will call the callback when a newline is entered
readline_callback_read_char
();
}
}
echo
"Prompting disabled. All done.\n"
;
?>
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