PHP Lesson 1: Briefly understand PHP_PHP Tutorial-PHP Tutorial-php.cn

PHP Lesson 1: Briefly understand PHP_PHP Tutorial

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Release： 2016-07-13 10:21:22

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PHP Lesson 1: Briefly understand PHP

Goal Planning:
Through the first lesson, we can understand the php environment.

1. Understanding of the environment:
2.Access method:
3. Modify the code and view it.
4. Use of variables
5. Code indentation should be hierarchical, and it is best to keep blank lines between codes
6. Variable naming:
7. Output of variables:
8. Three methods of variables:

1. Understanding of the environment:

Software download address: http://download.csdn.net/detail/junzaivip/7697331

The installation tutorial is very simple, you can search it on Baidu yourself

Directory structure after installation:

喎?http://www.Bkjia.com/kf/ware/vc/" target="_blank" class="keylink">vcD4KPHA+PC9wPgo8cD4yLrfDzsq3vbeoOjwvcD4KPHA+1rG909Ta5K/AwMb3yuTI6zpsb2NhbGhvc3QgvLS/ybfDzso8L3A+CjxwPjwvcD4KPHA+My7Q3rjEtPrC67ywsum/tC Suggested writing methods

<?php
echo "<html>";
echo "Hello world";
echo "/html";

?>

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<span style="font-family: Arial, Helvetica, sans-serif;"><html></span><span style="font-family: Arial, Helvetica, sans-serif;"> <?php echo "hello world";?></span><span style="font-family: Arial, Helvetica, sans-serif;"></html></span>

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4. Use of variables

<?php
	$name="junzaivip";
	
	echo "{$name} is good";
	?>

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5. Code indentation should be hierarchical, and it is best to keep blank lines between codes

6. Variable naming:
6.1. Try not to use Chinese
6.2. Try not to start with a number
6.3. Try not to use meaningless letters
6.4. Variable names are case-sensitive, function names are not case-sensitive, and class names are not case-sensitive either. Simply put variable names and functions in lowercase.
6.5. Definition of variables. The definition must be added with $

7. Output of variables:
echo $name;

8. Three methods of variables:
echo($name); //Output variable
var_dump($name);//Output the array and print the type and length
print_r($name);//Output array

example:

<?php
    $arr=array("胡军","垒成","大哥");
	print_r($arr);
	var_dump($arr);
	
	?>

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Displayed as follows

From the above display, we can see that the display is very ugly and does not require reading, so the formatted output solution is:

"; ?>

<?php
    $arr=array("胡军","垒成","大哥");
	echo "<pre class="code">";
	print_r($arr);
	echo "

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The results are displayed as follows:

Tips:

When encoding in Utf-8, a Chinese character is 3 characters

When gbk is encoded, one Chinese character is 2 characters