ECHO双单qoute

Question

我在HTML中的PHP代码

$i = 1;
echo "<input type='text' class='uborder help-80percent' maxlength='3' onkeypress='return isNumberKey(event)'' id='quantity_".$i."' onchange='updatetotalWeight(this.value, quantity_".$i.", current_quantity_".$i.", weight_".$i." )' />";

我想做我的：

updatetotalWeight(this.value, "quantity_1", "current_quanitity_1", "weight_1");

你知道如何让这个东西变成字符串吗？

Answer 1

您可以在双引号字符串中使用双引号，方法是使用反斜杠\"转义它们：

echo "<input type='text' class='uborder help-80percent' maxlength='3' onkeypress='return isNumberKey(event)' id='quantity_".$i."' onchange='updatetotalWeight(this.value, \"quantity_".$i."\", \"current_quantity_".$i."\", \"weight_".$i."\" )' />";

Answer 2

您需要转义双引号\"，同样，您不需要使用字符串连接.，即：

$i = 1;
echo "<input type='text' class='uborder help-80percent' maxlength='3' onkeypress='return isNumberKey(event)'' id='quantity_$i' onchange='updatetotalWeight(this.value, \"quantity_$i\", \"current_quantity_$i\", \"weight_$i\" )' />";

Answer 3

尝试使用双引号来翻看单引号并围绕字符串，这样你就可以获得插值的好处。

   $var = "quotes";
   echo "i hate \'$var\'"; // outputs  "i hate quotes 'quotes'"

基本上尽量避免使用＆＃39;＆＃39; 。 ＆＃39;＆＃39;因为它会导致很多混乱

祝你好运

Answer 4

或者，您可以使用HEREDOC来避免逃脱的所有需要​​。

<?Php
   echo <<<HEREDOCNAME
The string starts here.
Literal second line of your output string. Your {$variable}. Or if you want to echo a {$_SESSION['variable']} or a {$_POST['variable']}.
   This would be another literal end line with a literal tab. No need for backslash-n or backslash-t.
Need to echo a "double quote"? Or a 'single quote'?
Another end line and below is how to end the HEREDOC (note that the end line must not have any space before the heredoc name):
HEREDOCNAME;
   // note that curly braces can also be used on:
   echo "My variable is {$variable}."
   // But never on single quotes.
   echo 'Single quotes should always be like this: '.$variable;
   // Nevertheless, you can also avoid concatenations and curly braces.
   echo "This is my $variable";
   // But things can get nasty if
   echo "Your string and $variableasdsad are a mixed mess.";
   // So
   echo "always{$use}proper{$escaping}. Because thing\$cangetnastyjustlike$that."
?>