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php echo 輸出字串函數詳解

高洛峰
高洛峰原創
2017-01-21 13:33:191826瀏覽

echo "asd";//字符串 
echo "ads$c";//字符串+变量 
echo 'ads$c';//字符串 asd$c $c不是变量 
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多行输出方法 
echo <<<END 
This uses the "here document" syntax to output 
END; 
//输出简写 
<?php echo $a;?>   <?=$a?>
<?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[&#39;value&#39;]} !"; // this is foo ! 

// Using single quotes will print the variable name, not the value 
echo &#39;foo is $foo&#39;; // 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 &#39;This &#39;, &#39;string &#39;, &#39;was &#39;, &#39;made &#39;, &#39;with multiple parameters.&#39;, chr(10); 
echo &#39;This &#39; . &#39;string &#39; . &#39;was &#39; . &#39;made &#39; . &#39;with concatenation.&#39; . "\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 &#39;true&#39; : echo &#39;false&#39;; 

// However, the following examples will work: 
($some_var) ? print &#39;true&#39; : print &#39;false&#39;; // print is also a construct, but 
// it behaves like a function, so 
// it may be used in this context. 
echo $some_var ? &#39;true&#39;: &#39;false&#39;; // 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送到結果中的字串 
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「()」將會產生錯誤。 
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。 I

<?php 
$str = "Who&#39;s Kai Jim?"; 
echo $str; 
echo "<br />"; 
echo $str."<br />I don&#39;t know!"; 
?>

The output of the code above will be: 
上述程式碼將輸出下面的結果: 

This text spans multiple lines. 


Example 3 
案例33] 37be 將上述程式碼輸出下面的結果: 
This string was made with multiple parameters 

Example 4 

案例4 

Difference of single and double quotes. Stes will print the v​​alable name, 名詞(”)的不同。單引號將輸出變數名,而不是變數的值: 

<?php 
echo "This textspans multiplelines."; 
?>

The output of the code above will be: 
上述程式碼將輸出下面的結果: 
Roses are redRoses are $color o🠎 5 
案例5 

Shortcut syntax: 

簡寫(捷徑)文法: 

<?php 
echo &#39;This &#39;,&#39;string &#39;,&#39;was &#39;,&#39;made &#39;,&#39;with multiple parameters&#39;; 
?>

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