readline_callback_handler_install Initializes the readline callback interface and terminal, prints the prompt and returns immediately


readline_callback_handler_install

(PHP 5 >= 5.1.0)

readline_callback_handler_installInitializes 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. 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().

参数

prompt

The prompt message.

callback

The callback function takes one parameter; the user input returned.

返回值

成功时返回 TRUE, 或者在失败时返回 FALSE.

范例

Example #1 Readline Callback Interface Example

<?php
function rl_callback($ret)
{
    global 
$c$prompting;

    echo 
"You entered: $ret ";
    
$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) {
    
$w NULL;
    
$e NULL;
    
$n stream_select($r = array(STDIN), $w$enull);
    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. ";
?>

参见


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