Detaillierte Erklärung der PHP-Echo-Ausgabezeichenfolgenfunktion

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 
?>

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

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

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

<?php 
$color = "red"; 
echo "Roses are $color"; 
echo "<br />"; 
echo &#39;Roses are $color&#39;; 
?>