PHP standard input?

Chris_Lutz_60777 0
Viewed 85196

I know PHP is usually used for web development, where there is no standard input, but PHP claims to be usable as a general-purpose scripting language, if you do follow it's funky web-based conventions. I know that PHP prints to stdout (or whatever you want to call it) with print and echo, which is simple enough, but I'm wondering how a PHP script might get input from stdin (specifically with fgetc(), but any input function is good), or is this even possible?

stdin file-io php
10 Answers

It is possible to read the stdin by creating a file handle to php://stdin and then read from it with fgets() for a line for example (or, as you already stated, fgetc() for a single character):

<?php
$f = fopen( 'php://stdin', 'r' );

while( $line = fgets( $f ) ) {
  echo $line;
}

fclose( $f );
?>
sikx_667600

Reading from STDIN is recommended way

<?php
while (FALSE !== ($line = fgets(STDIN))) {
   echo $line;
}
?>
user_2392470

A simple method is 

$var = trim(fgets(STDIN));
user_12014920

You can use fopen() on php://stdin:

$f = fopen('php://stdin', 'r');
user_241810

IIRC, you may also use the following:

$in = fopen(STDIN, "r");
$out = fopen(STDOUT, "w");

Technically the same, but a little cleaner syntax-wise.

Fritz_H_671390

Instead of manually opening STDIN stream, use built in readline() function if you just want to read a single line without too much a hassle :

<?php
$age= readline("Enter your age: ");
echo "Your age is : ".$age;

PHP documentation is your friend : https://www.php.net/manual/en/function.readline.php

user_98950700
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