PHP readline_add_history() Function

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The readline_add_history() is an inbuilt function in PHP that is used to add a line to the command line history.

Syntax:

readline_add_history($prompt): bool

Parameter:

This function accepts only a single parameter that is described below.

$prompt: This is a string parameter that adds to a line in the command line history. It should be a string parameter.

Return Value:

The return value of the readline_add_history() function is a boolean value. If this function successfully adds a line to the command line history, then it will return “true” otherwise on failure it will return “false”.

Program 1: The following program demonstrates the readline_add_history() Function.

PHP

<?php 
readline_clear_history(); 
  
// Add lines to command line history 
readline_add_history("First line"); 
readline_add_history("Second line"); 
readline_add_history("Third line"); 
  
// Retrieve command line history 
$history = readline_list_history(); 
print_r($history); 
?>

Output

Array
(
    [0] => First line
    [1] => Second line
    [2] => Third line
)

Program 2: The following program demonstrates the readline_add_history() Function.

PHP

<?php 
  
readline_clear_history(); 
  
// Add lines to command line history 
readline_add_history("Line 1"); 
readline_add_history("Line 2"); 
readline_add_history("Line 3"); 
  
// Retrieve the command line history 
$history = readline_list_history(); 
  
// Print the command line history in reverse order 
for ($i = count($history) - 1; $i >= 0; $i--) { 
    echo "[$i] {$history[$i]}" . PHP_EOL; 
} 
?>

Output

[2] Line 3
[1] Line 2
[0] Line 1

Program 3: The following program demonstrates the readline_add_history() Function.

PHP

<?php 
readline_clear_history(); 
  
// Add lines to command line history using a loop 
for ($i = 1; $i <= 5; $i++) { 
    $line = "Line $i"; 
    readline_add_history($line); 
} 
  
// Retrieve the command line history 
$history = readline_list_history(); 
  
// Print the command line history 
foreach ($history as $index => $line) { 
    echo "[$index] $line" . PHP_EOL; 
} 
?>

Output

[0] Line 1
[1] Line 2
[2] Line 3
[3] Line 4
[4] Line 5

Reference: https://www.php.net/manual/en/function.readline-add-history.php

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