在PHP中,常用的输出函数有以下几种:
echo
echo string1, string2, ...;
php
echo "Hello, World!";
print string;
php
print "Hello, World!";
print_r
print_r(variable, return);
php
$array = array("a" => "apple", "b" => "banana");
print_r($array);
var_dump
var_dump(variable);
php
$array = array("a" => "apple", "b" => "banana");
var_dump($array);
printf
printf(format, arg1, arg2, ...);
php
printf("Hello, %s!", "World");
sprintf
sprintf(format, arg1, arg2, ...);
php
$result = sprintf("Hello, %s!", "World");
echo $result;
var_export
var_export(variable, return);
php
$array = array("a" => "apple", "b" => "banana");
var_export($array);
这些函数在不同的场景下有不同的用途,选择合适的函数可以提高代码的可读性和效率。