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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