php 输出方法 PHP输出打印方法

PHP输出打印方法

1. echo()输出字符串，PHP允许我们在双引号串中直接包含字串变量，而单引号串中的内容总被认为是普通字符。

2. mixed print_r ( mixed$expression [, bool$return = false ] ) 打印变量 print_r—Prints human-readable information about a variableprint_r打印普通字符串会报错

void var_dump ( mixed$expression [, mixed$... ] )打印变量的详细信息 var_dump—Dumps information about a variable

$arr=array(array(‘a‘=>‘aa‘,‘b‘=>‘bbb‘,‘c‘=>‘ccc‘),

array(‘a‘=>‘ddd‘,‘b‘=>‘eee‘,‘c‘=>‘fff‘),

array(‘a‘=>‘gg‘,‘b‘=>‘hh‘));

echo ‘======= print_r($arr)======= ‘; //使用单引号‘‘

echo ‘

‘;

print_r($arr);

echo ‘

‘;

echo ‘======= var_dump($arr)======= ‘;

echo ‘

‘;

var_dump($arr);

?>

输出结果：

======= print_r($arr)=======

Array ( [0] => Array ( [a] => aa [b] => bbb [c] => ccc ) [1] => Array ( [a] => ddd [b] => eee [c] => fff ) [2] => Array ( [a] => gg [b] => hh ) )

======= var_dump($arr)=======

array (size=3)

0 =>

array (size=3)

‘a‘ => string ‘aa‘ (length=2)

‘b‘ => string ‘bbb‘ (length=3)

‘c‘ => string ‘ccc‘ (length=3)

1 =>

array (size=3)

‘a‘ => string ‘ddd‘ (length=3)

‘b‘ => string ‘eee‘ (length=3)

‘c‘ => string ‘fff‘ (length=3)

2 =>

array (size=2)

‘a‘ => string ‘gg‘ (length=2)

‘b‘ => string ‘hh‘ (length=2)

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