First knowledge of PHP (a) Basic grammar, the first knowledge of PHP basic Grammar _php Tutorial

First Knowledge of PHP (i) basic grammar, the first knowledge of PHP basic grammar

Always ready to learn PHP, the results of a period of time there is always something, delayed for a while. Hurry up and catch up now!

This series just talk about my comments on PHP, not the nature of the tutorial. In addition, I am a small white, just write essays, the Great God for a pat. I have studied C, Java, Python, and touched some HTML. If you have a similar experience with my friends want to contact PHP if you can provide some ideas, it would be better.

In my opinion, PHP has a thick HTML style, which is really worthy of being born for the Web programming. One of the biggest features is the way variables are used. In languages such as C,python, a variable is a number of characters that are called directly by name, such as the classic for (i=0;i<50;i++). But PHP is much closer to HTML in the way the variables are handled, the characters that are written directly are considered strings, and the use of variables requires $ to start with: for ($i =0; $i <50; $i + +) It makes me very uncomfortable, I think it would be very troublesome to write this way. But seeing the processing of strings, I found that this has the advantage:

The concatenation of strings in PHP can be done using "," like Python, such as:

　　$a=' Bob ';
echo "Hello",$a;

Results such as:

$a=' Bob ';
echo "Hello". $a;

The result is the same:

$a=' Bob ';
echo "Hello $a";

is still the same result:

　

　　This is the unique style of PHP.

Another feature is the array in PHP. An array of PHP. The array of PHP seems to me to be a collection of Python lists and dictionaries. For the stored data, he does not like the array of C need to declare the type, regardless of the shape or string can be mixed stored in the same group of "peaceful coexistence"; He also supports the use of strings to index the usage of traditional arrays, which can be indexed using a string, which is very much like a python dictionary. It is a particularly strange thing, but it is particularly convenient to think carefully.

$arr = array ( 0 => + , ' G ' => ' GGG ' , 1 => ' www ' , ' h ' => ' HHH ' );
Print_r ( $arr );

　　　　For example, arr is an array that holds four elements, No. 0 is integer 50, the next element is a string GGG, uses the character "G" index, the third element is the 1th element string www, and the fourth element is a string hhh, using the character "H" index.

Next, use the array_push function to append a string element to the array after www

$ Arr = array ( 0 => + , ' G ' => ' GGG ' , 1 => ' www ' , ' h ' => ' HHH ' );
Array_push ( $arr , ' www ' );
Print_r ( $arr );

span> span> For example, the appended element is the fifth element, but continues to sort using index 2nd.

That's how I feel about PHP's basic syntax.

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