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 程式師世界 >> 編程語言 >> 網頁編程 >> PHP編程 >> 關於PHP編程 >> php echo 輸出字符串函數詳解

php echo 輸出字符串函數詳解

編輯:關於PHP編程

復制代碼 代碼如下:
echo "asd";//字符串
echo "ads$c";//字符串+變量
echo 'ads$c';//字符串 asd$c $c不是變量
echo "sd"."vs";
echo "sd","vs";
echo $a;
echo $a.$b;
echo $a,$b;
echo $a.$b.$c;
echo $a,$b,$c;
echo "kaskd{$c}asd";
echo "kakskd{$arr['lo']}";
echo "kakskd{$obj->a}";
echo "kaskd".$c."kasd";
echo "kaskd".$arr['lo']."kasd";
echo "kaskd".$obj->a."kasd";
echo "kaskd".func($c)."kasd";
echo "kaksk".($a+1)."dkkasd";
echo $c."jaksd";
echo $c,"jaksd";
//php多行輸出方法
echo <<<END
This uses the "here document" syntax to output
END;
//輸出簡寫
<?php echo $a;?>   <?=$a?>


復制代碼 代碼如下:
<?php
echo "Hello World";

echo "This spans
multiple lines. The newlines will be
output as well";

echo "This spans\nmultiple lines. The newlines will be\noutput as well.";

echo "Escaping characters is done \"Like this\".";

// You can use variables inside of an echo statement
$foo = "foobar";
$bar = "barbaz";

echo "foo is $foo"; // foo is foobar

// You can also use arrays
$baz = array("value" => "foo");

echo "this is {$baz['value']} !"; // this is foo !

// Using single quotes will print the variable name, not the value
echo 'foo is $foo'; // foo is $foo

// If you are not using any other characters, you can just echo variables
echo $foo; // foobar
echo $foo,$bar; // foobarbarbaz

// Some people prefer passing multiple parameters to echo over concatenation.
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters.', chr(10);
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "\n";

echo <<<END
This uses the "here document" syntax to output
multiple lines with $variable interpolation. Note
that the here document terminator must appear on a
line with just a semicolon. no extra whitespace!
END;

// Because echo does not behave like a function, the following code is invalid.
($some_var) ? echo 'true' : echo 'false';

// However, the following examples will work:
($some_var) ? print 'true' : print 'false'; // print is also a construct, but
// it behaves like a function, so
// it may be used in this context.
echo $some_var ? 'true': 'false'; // changing the statement around
?>

以下是官方手冊說明:
Definition and Usage
定義和用法
The echo() function outputs one or more strings.
echo()函數的作用是:輸出一個或多個字符串。
Syntax
語法
echo(strings)
Parameter參數 Description描述
strings Required. One or more strings to be sent to the output
必要參數。指定一個或多個需要被發送到結果中的字符串
Tips and Notes
提示和注意點
Note: The echo() function is not actually a function, so you are not required to use parentheses with it. However, if you want to pass more than one parameter to echo(), using parentheses will generate a parse error.
注意:echo()函數不是一個真正意義上的函數,所以你沒有必要一定去使用它。如果你想把多於一個的參數傳遞給echo()函數,那麼使用圓括號“()”將產生錯誤。
Tip: The echo() function is slightly faster than print().
提示:echo()函數相當於print()函數的簡化版本。
Tip: The echo() function has the following shortcut syntax. See example 5.
提示:echo()函數包含下面的簡便寫法。具體見:案例5。
Example 1
案例1
復制代碼 代碼如下:
<?php
$str = "Who's Kai Jim?";
echo $str;
echo "<br />";
echo $str."<br />I don't know!";
?>

The output of the code above will be:
上述代碼將輸出下面的結果:
Who's Kai Jim?Who's Kai Jim?I don't know!

Example 2
案例2
復制代碼 代碼如下:
<?php
echo "This textspans multiplelines.";
?>

The output of the code above will be:
上述代碼將輸出下面的結果:
This text spans multiple lines.

Example 3
案例3
復制代碼 代碼如下:
<?php
echo 'This ','string ','was ','made ','with multiple parameters';
?>

The output of the code above will be:
上述代碼將輸出下面的結果:
This string was made with multiple parameters

Example 4
案例4
Difference of single and double quotes. Single quotes will print the variable name, not the value:
區別單引號(')和雙引號(”)的不同。單引號將輸出變量名,而不是變量的值:
復制代碼 代碼如下:
<?php
$color = "red";
echo "Roses are $color";
echo "<br />";
echo 'Roses are $color';
?>

The output of the code above will be:
上述代碼將輸出下面的結果:
Roses are redRoses are $color

Example 5
案例5
Shortcut syntax:
簡寫(捷徑)語法:
復制代碼 代碼如下:
<html><body>
<?php
$color = "red";
?><p>Roses are <?=$color?></p></body></html>

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