1.1 First PHP
Copy CodeThe code is as follows:
<title>my-A-PHP program</title>
<body>
<?php
echo "Hello everybody!";
?>
</body>
Attach: Use of phpinfo () function
1.2 Input PHP Script
1.2.1 Mark PHP Code paragraph
1.2.2 Statements and comments
/* */
//
#
#
1.2.3 PHP and HTML blends
1.3 How to store data
1.4 Enter the basic data type of PHP
1.4.1 numbers: (int) and floating-point number (float)) octal must precede the number with 0 (0), and hexadecimal indicates that the number must precede 0x.
Note: 1 Floating-point number operations, only approximate values are taken
2 5/2=2.5 want to take the integer with round () function
1.4.2 String
Single quotation mark: ' To enclose a single quote in a string, simply precede it with a backslash.
The easiest way to define a string is to surround it with single quotes (punctuation marks).
To output a single quote, precede it with a backslash (\). To output a backslash before the single quote or at the end of the string, enter two (\)
Note that if you add a backslash before any other character, the backslash will be output directly.
Double quote ""
Escaped characters escape character meaning
\ n-line wrap (LF or 0x0A in ASCII)
\ r Carriage return (CR or 0x0D () in ASCII)
\ t Horizontal tab (HT or 0x09 (9) in ASCII)
\v Vertical tab (VT or 0x0b (one) in ASCII) (since PHP 5.2.5)
\f page Break (FF or 0x0C () in ASCII) (since PHP 5.2.5)
\ reverse Slash
\$ Dollar Dollar mark
\ "Double Quotes
\[0-7]{1,3} A string that conforms to the order of the expression is a octal character
\x[0-9a-fa-f]{1,2} A string that conforms to the order of the expression is a hexadecimal character
1.5 Some in very useful functions
1.5.1 NL2BR: Inserts an HTML newline character for each new line (\ n) of the string
Copy CodeThe code is as follows:
<?php
echo nl2br ("foo isn ' t\n bar");
?>
1.5.2 var_dump: View type and variable values
1.5.3 Print_r: Returns the result to a string rather than outputting the result to the output stream. This user-interface-friendly output is particularly useful for objects and arrays
Print_r () displays information that is easy to understand about a variable. If a string, integer, or float is given, the variable value itself is printed.
If you give an array, the keys and elements will be displayed in a certain format. object is similar to an array.
1.5.4 Var_export: It's similar to Var_dump, except that its output is actually a valid PHP code representation of the data value provided
Copy CodeThe code is as follows:
<?php
$arr =array (1,2,3,4);
Var_exprot ($arr);
?>
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