php字符串有哪几种定义方式

'; // 可以录入多行 echo 'You can also have embedded newlines in strings this way as it is okay to do'; echo '
'; // 输出： Arnold once said: "I'll be back" echo 'Arnold once said: "I\'ll be back"'; echo '
'; // 输出： You deleted C:\*.*? echo 'You deleted C:\\*.*?'; echo '
'; // 输出： You deleted C:\*.*? echo 'You deleted C:\*.*?'; echo '
'; // 输出： This will not expand: \n a newline echo 'This will not expand: \n a newline'; echo '
'; // 输出： Variables do not $expand $either echo 'Variables do not $expand $either'; echo '
'; ?>

"; // 也可以录入多行 echo "You can also have embedded newlines in strings this way as it is okay to do"; ?>

        

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PHP Parse error: Invalid body indentation level (expecting an indentation level of at least 3) in example.php on line 4

        

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PHP Parse error: Invalid indentation - tabs and spaces cannot be mixed in example.php line 8

        

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array(2) { [0] => string(11) "a b c" [1] => string(5) "d e f" }

        

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foo = 'Foo'; $this->bar = array('Bar1', 'Bar2', 'Bar3'); } } $foo = new foo(); $name = 'MyName'; echo <<<'EOT' My name is "$name". I am printing some $foo->foo. Now, I am printing some {$foo->bar[1]}. This should not print a capital 'A': \x41 EOT; ?>

 "purple"); echo "He drank some $juices[0] juice.".PHP_EOL; echo "He drank some $juices[1] juice.".PHP_EOL; echo "He drank some $juices[koolaid1] juice.".PHP_EOL; class people { public $john = "John Smith"; public $jane = "Jane Smith"; public $robert = "Robert Paulsen"; public $smith = "Smith"; } $people = new people(); echo "$people->john drank some $juices[0] juice.".PHP_EOL; echo "$people->john then said hello to $people->jane.".PHP_EOL; echo "$people->john's wife greeted $people->robert.".PHP_EOL; echo "$people->robert greeted the two $people->smiths."; // Won't work ?>

width}00 centimeters broad."; // 有效，只有通过花括号语法才能正确解析带引号的键名 echo "This works: {$arr['key']}"; // 有效 echo "This works: {$arr[4][3]}"; // 这是错误的表达式，因为就象 $foo[bar] 的格式在字符串以外也是错的一样。 // 换句话说，只有在 PHP 能找到常量 foo 的前提下才会正常工作；这里会产生一个 // E_NOTICE (undefined constant) 级别的错误。 echo "This is wrong: {$arr[foo][3]}"; // 有效，当在字符串中使用多重数组时，一定要用括号将它括起来 echo "This works: {$arr['foo'][3]}"; // 有效 echo "This works: " . $arr['foo'][3]; echo "This works too: {$obj->values[3]->name}"; echo "This is the value of the var named $name: {${$name}}"; echo "This is the value of the var named by the return value of getName(): {${getName()}}"; echo "This is the value of the var named by the return value of \$object->getName(): {${$object->getName()}}"; // 无效，输出： This is the return value of getName(): {getName()} echo "This is the return value of getName(): {getName()}"; // 无效, 输出： C:\folder\{fantastic}.txt echo "C:\folder\{$great}.txt" // 有效, 输出： C:\folder\fantastic.txt echo "C:\\folder\\{$great}.txt" ?>

$bar}\n"; echo "{$foo->{$baz[1]}}\n"; ?>