PHP sprintf的用法

Question

实例一:这是正确的 <?php $num = 5; $location = 'tree'; $format = 'The %2$s contains %1$d monkeys'; echo sprintf($format, $num, $location) ?> 实例二:为什么这是错误的 <?php $num = 5; $location = 'tree'; $format = "The %2$s contains %1$d monkeys"; echo sprintf($format, $num, $location) ?>

Answer 1

例二中双引号中需要转义

$format = "The %2\$s contains %1\$d monkeys";

Answer 2

把$符转义即可

"The %2\$s contains %1\$d monkeys"