I've been trying to learn PHP for the past week and I'm stuck at a particular problem. Please excuse my poorly worded title as I haven't grasped the jargon yet. Here's my code: $query = "SELECT $tablefields FROM $tablename"; $sth = $dbconn->prepare($query); for ($x = 1; $x <=3; $x++){ echo '<br /> This is an iteration ',$x; $sth->execute(); for
我一直在努力学习过去一周的PHP，并且陷入了一个特定的问题。 请原谅我题目不佳，因为我还没有掌握行话。 这是我的代码： $query = "SELECT $tablefields FROM $tablename"; $sth = $dbconn->prepare($query); for ($x = 1; $x <=3; $x++){ echo '<br /> This is an iteration ',$x; $sth->execute(); foreach ($sth->fetchall() as $row) { $results = $row[$tablefields
Suppose I have two PHP statements: echo "foo"."bar" echo "foo", "bar" Notice the different ways of concatenating the strings - using a . or a , . I realise the actual differences between the two methods, that using , gives multiple parameters to the keyword echo , whereas using . actually joins the strings together before echo ing. But my question is, which way is faster? Aotoki's
假设我有两个PHP语句： echo "foo"."bar" echo "foo", "bar" 注意串联字符串的不同方式 - 使用a . 或者, 。 我意识到两种方法之间的实际区别，即使用,给关键字echo多个参数，而使用. 实际上在echo之前将字符串连接在一起。 但我的问题是，哪种方式更快？ Aotoki的回答是不真实的。 双引号字符串可以包含一个变量。 逗号和点与变量与文字字符串无关。 当使用echo（一种“语言结构”）时，可以声明多个参数。 这样做
I wonder if it is possible to display a part of image using file_get_contents . Currently I'm using this code to display the image without revealing its link/location <img src="data:image/gif;base64,<?php echo base64_encode(file_get_contents($image)); ?> "> Is there a way to just display 1/3 or 1/2 of the image using file_get_contents ? To do this, you need to decode, crop a
我想知道是否可以使用file_get_contents显示图像的一部分。 目前，我正在使用此代码来显示图片而不透露其链接/位置 <img src="data:image/gif;base64,<?php echo base64_encode(file_get_contents($image)); ?> "> 有没有办法使用file_get_contents显示1/3或1/2的图像？ 为此，您需要对图像进行解码，剪裁和重新编码。 在PHP中，您可以使用GD库来执行此操作，例如： # load source image and get its size $i
I just discovered something. echo $var1 , " and " , $var2; is the same as: echo $var1 . " and " . $var2; What is the actual string concatenation operator in php? Should I be using . or , ? The . operator is the concatenation operator. Your first example only works because the echo 'function' (technically it's a language construct, but lets not split hairs) accepts more than
我刚发现了一些东西。 echo $var1 , " and " , $var2; 是相同的： echo $var1 . " and " . $var2; 什么是PHP中的实际字符串连接运算符？ 我应该使用. 或者, ？ 这个. 运算符是连接运算符。 您的第一个示例仅适用于echo函数（技术上它是一种语言结构，但不允许分割头发）接受多个参数，并且会打印每个参数。 因此，第一个示例是使用多个参数调用echo，并且它们都被打印出来，而第二个示例中所有字符串都是concatenate
This question already has an answer here: Difference between period and comma when concatenating with echo versus return? 6 answers It's . for Concatenation. Your code should to be as, $b = "HTML"; $a = "test" . $b . "printing"; echo $a; Output : testHTMLprinting For whitespace, you should use $b = "HTML"; $a = "test" . " " . $b . " " . "printing"; echo $a; Output : test HTML p
这个问题在这里已经有了答案： 与echo和return连接时的句号和逗号之间的区别？ 6个答案 是的. 用于连接。 你的代码应该是， $b = "HTML"; $a = "test" . $b . "printing"; echo $a; 输出： testHTMLprinting 对于空格，你应该使用 $b = "HTML"; $a = "test" . " " . $b . " " . "printing"; echo $a; 输出： test HTML printing
I just found that this will work: echo $value , " contiue"; but this does not: return $value , " contiue"; While "." Works in both. What is the difference between a period and a comma here? return does only allow one single expression. But echo allows a list of expressions where each expression is separated by a comma. But note that since echo is not a function but a special
我只是发现这将起作用： echo $value , " contiue"; 但是这不： return $value , " contiue"; 虽然“。” 适用于两者。 这里的时间和逗号之间有什么区别？ return只允许一个表达式。 但是， echo允许使用逗号分隔每个表达式的表达式列表。 但请注意，由于echo不是函数，而是特殊的语言结构，因此将表达式列表包装在括号内是非法的。 你还必须注意到，作为构造的echo比用逗号更快。 所以，如果你加入一个角色400万次
echo date('Y-m-d H:m:s', strtotime('15 minutes ago')) . "<br/>"; echo date('Y-m-d H:m:s', time()-900) . "<br/>"; echo date('Y-m-d H:m:s', time()); 我在Windows 7上运行WAMPP，并且所有3次调用都返回同一时间。 'H:m:s' should be 'H:i:s' ^ ^ Spot the difference m = Months i = Minutes The error in your code: 'Ymd H:m:s' should be 'Ymd H:i:s' m is m
echo date('Y-m-d H:m:s', strtotime('15 minutes ago')) . "<br/>"; echo date('Y-m-d H:m:s', time()-900) . "<br/>"; echo date('Y-m-d H:m:s', time()); 我在Windows 7上运行WAMPP，并且所有3次调用都返回同一时间。 'H:m:s' should be 'H:i:s' ^ ^ 指出不同 m =几个月 我=分钟 你的代码中的错误： 'Ymd H：m：s'应该是'Ymd H：i：s' m是月份，我是分钟
I'm having some issues with my php script. For some reason the date function gives a totally different time then my servers date function. For instance php date gives me: Saturday 28th of March 2015 01:05:12 AM While centos date gives me: Fri Mar 27 18:05:12 PDT 2015 I noticed the issue because my contab's which are scheduled to run at midnight are running at the wrong time despite
我遇到了一些与我的PHP脚本有关的问题。 由于某些原因，日期函数给出了完全不同的时间，然后我的服务器日期函数。 例如，php的日期给了我： Saturday 28th of March 2015 01:05:12 AM 虽然centos date给了我： Fri Mar 27 18:05:12 PDT 2015 我注意到了这个问题，因为尽管服务器日期时间正确，但我的contab's计划在午夜运行，但运行时间错误。 我不明白发生了什么事情，因为直到几天前这工作得很好。 “完全不同的
Published Date returned from Twitter Search API Atom Feed as 2008-11-03T21:30:06Z which needs to be converted to "X seconds/minutes/hours/days ago" for showing how long ago twitter messages were posted. Think this can be done with php date() function using DATE_ATOM value? function time_since($your_timestamp) { $unix_timestamp = strtotime($your_timestamp); $seconds = time() -
从Twitter搜索API Atom Feed返回的发布日期为2008-11-03T21：30：06Z，需要将其转换为“X秒/分钟/小时/天前”，以显示多久之前发布的Twitter消息。 认为这可以通过使用DATE_ATOM值的php date（）函数来完成？ function time_since($your_timestamp) { $unix_timestamp = strtotime($your_timestamp); $seconds = time() - $unix_timestamp; $minutes = 0; $hours = 0; $days = 0; $weeks = 0; $mont
DateTime::Diff should calculate a proper interval and take into account Daylight Savings Time (DST) and leap years. Although apparently it isn't so. Code of horror: $d1 = new DateTime("2011-10-30 01:05:00", new DateTimeZone("Europe/Stockholm")); $d2 = new DateTime("2011-10-30 03:05:00", new DateTimeZone("Europe/Stockholm")); echo $d1->getOffset() / (60 * 60); Prints '2'! Keep
DateTime :: Diff应计算适当的时间间隔并考虑夏令时（DST）和闰年。 虽然显然不是这样。 恐怖代码： $d1 = new DateTime("2011-10-30 01:05:00", new DateTimeZone("Europe/Stockholm")); $d2 = new DateTime("2011-10-30 03:05:00", new DateTimeZone("Europe/Stockholm")); echo $d1->getOffset() / (60 * 60); 打印'2'！ 请记住，UTC时间= 1小时 - 2小时= 23:05:00前一天。 echo $d2->getOffset() / (60