Php Test If Array

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PHP traverses two-dimensional array and multi-dimensional array code

PHP Tutorial Traversing two-dimensional array and multi-dimensional array code On the PHP array, let's talk about two-dimensional array and multi-dimensional traversal code, the following three examples to test the array traversal PHP code function. * / function arr_foreach ($ arr) {if (! is_array ($ arr)) {return false;} foreach ($ arr as $ key = & ...

PHP detection array length function sizeof count

php tutorial to detect the length of the array function sizeof count in php detection array length function sizeof count Now see a simple example * / $ colorlist = array ("apple" => "red", "grass" => "green", " sky "=>" bl ...

PHP operation MySQL 3rd pass the next day

In this lesson, we're going to do some more complicated work to show the data in multiple rows, the database exchanging data one, the while loop in this lesson, we will continue to drill down and use PHP and MySQL to write some simple and useful pages.   We start with the database we created yesterday and display the data in the library, but we'll touch it a little bit. First, we use the following code to query the contents of the database. <html> <body> <?php $db = Mys ...

php test file type (based on the file header information)

Article provides a php tutorial to detect the file type (based on the file header information) Oh, he can according to the user's header file information to confirm the type of file. <? php / * By file name, get the file type * * @ author chengmo * * @ copyright cnblog.com/chengmo 2010-10-17 * @ version 0.1 * $ filename = "d: /1.png"; ec. ..

53 points to improve the efficiency of PHP programming

It would be faster to enclose the string in single quotes instead of double quotes. Because PHP searches for variables in double-quoted strings, single quotes do not. Note that only echo can do this: it's a "function" that takes multiple strings as arguments, Echo is a language structure, not a real function, so the function with double quotes). 1, if you can define the class method as static, as far as the definition of static, it will speed up nearly 4 times. 2, $ row ['id'] speed ...

PHP development in the most common 10 mistakes

PHP is a very popular open source server-side scripting language, and most of the sites you see on the World Wide Web are developed using PHP. This experience will introduce you to the 10 most common PHP development problems, hoping to be helpful to friends. Error 1: Leave a dangling pointer after a foreach loop In a foreach loop, if we need to change the elements of an iteration or in order to http://www.aliyun.com/zixun/aggregation/7208.html "> increase efficiency ...

Learn 10 basic knowledge of php summary

Learn 10 basic knowledge of PHP Summary Read some of the basics of PHP, I summarize here: 1, embedded in the HTML PHP script there are three ways: The following is quoted content: <script language = "php"> / / embedded Way an echo ("test"); </ script> <? // embedded two echo "<br & g ...

PHP does not need database traffic statistics code

We want to provide the following PHP tutorial flow Statistics Code is the basic text file without a database tutorial, below we start from simple to complex page access count counter code instance. <HTML> <HEAD> <TITLE> File System based page Counter example </TITLE> </HEAD> <BODY> PHP $countfile = "num.t ...

Three ways to send mail code in PHP

We use three kinds of PHP tutorials to send mail instance program Oh, here are a variety of examples sent to send mail oh. if (Send_mail (' test@qq.com ', ' mail subject ', ' message content ') = = "") {echo "sent successfully!" <br> "; else{Echo sent failed! <br> "; <?php $to = ...

Fourteen PHP head start to make a big headache summary

Fourteen make PHP beginners a big headache Summary Today for everyone to give PHP beginners a headache big summary, the following 14 questions hope for PHP beginners to help. 1, the page can not be passed variables get, post, session Automatic global variables in the latest php version is turned off, so to get over the variables from the previous page to use $ _GET ['foo'], $ _ POST [ 'foo'], $ _ SESSION ['foo']. Of course it can be ...

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