PHP应用：PHP编程入门的基本语法知识点总结

PHP教程
User: newasp
License:
===== LICENSE BEGIN =====
14617-12042010
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NVHtrbzv8O9mmoLvtijcHSSE7i5Jr!
===== LICENSE END ====

PHP教程
<?php
/**
 * Created by PhpStorm.
 * User: LENOVO
 * Date: 2014/9/28
 * Time: 14:51
 */
// 输出PHP详细信息
echo phpinfo();
 
//C:\php-5.6.1-Win32-VC11-x86\php.exe D:\dizzy\php_test\index.php
//phpinfo()
//PHP Version => 5.6.1
//
//System => Windows NT LENOVO-PC 6.1 build 7600 (Windows 7 Ultimate Edition) i586
//Build Date => Sep 24 2014 18:54:12
//Compiler => MSVC11 (Visual C++ 2012)
//Architecture => x86
//Configure Command => cscript /nologo configure.js "--enable-snapshot-build" "--disable-isapi" "--enable-debug-pack" "--without-mssql" "--without-pdo-mssql" "--without-pi3web" "--with-pdo-oci=c:\php-sdk\oracle\x86\instantclient_12_1\sdk,shared" "--with-oci8-12c=c:\php-sdk\oracle\x86\instantclient_12_1\sdk,shared" "--enable-object-out-dir=../obj/" "--enable-com-dotnet=shared" "--with-mcrypt=static" "--without-analyzer" "--with-pgo"
//Server API => Command Line Interface

PHP教程
// 一个简单的html表单
<form action="action.php" method="post">
  <p>姓名: <input type="text" name="name" /></p>
  <p>年龄: <input type="text" name="age" /></p>
  <p><input type="submit" /></p>
</form>
 
// action.php 接收表单数据, 使用超全局变量
%_POST["name"]
%_POST["age"]
<?php echo htmlspecialchars($_POST['name']); ?>
<?php echo (int)$_POST['age']; ?>
// 这就是最简单的表单提交,及数据接收

PHP教程
<?php
 
echo "Hello World!";
 
// 当文件为纯PHP时,最好在末尾删除PHP结束标志
//?>

PHP教程
// 在一对开始和结束之外的内容,都会被PHP解释器忽略.也便是html标签和PHP代码混合的那种,跟jsp,asp一样...
<p>This is going to be ignored by PHP and displayed by the browser.</p>
<?php echo 'While this is going to be parsed.'; ?>
<p>This will also be ignored by PHP and displayed by the browser.</p>
 
// 使用条件,高级分离
<?php if ($expression == true): ?>
  This will show if the expression is true.
<?php else: ?>
  Otherwise this will show.
<?php endif; ?>

PHP教程
<?php
$a_bool = TRUE;  // a boolean
$a_str = "foo"; // a string
$a_str2 = 'foo'; // a string
$an_int = 12;   // an integer
 
echo gettype($a_bool); // prints out: boolean
echo gettype($a_str); // prints out: string
 
// If this is an integer, increment it by four
if (is_int($an_int)) {
  $an_int += 4;
}
 
// If $bool is a string, print it out
// (does not print out anything)
if (is_string($a_bool)) {
  echo "String: $a_bool";
}
?>

PHP教程
echo (int)2.9; // 输出 2
echo round(2.555, 2) // 输出 2.56
// 决不要将未知的分数强制转换为 integer,这样有时会导致弗成预料的结果.
<?php
echo (int) ( (0.1+0.7) * 10 ); // 显示 7!
?>

PHP教程
<?php
$a = 1.234;
$b = 1.2e3;
$c = 7E-10;
?>

PHP教程
<?php
$a = 123;
echo '$a'; // 输出 $a
echo "$a"; // 输出 123, 转义字符 '\'
 
$str = <<<'EOD'
Example of string
spanning multiple lines
using nowdoc syntax.
EOD;
 
?>

PHP教程
<?php
$array = array(
  "foo" => "bar",
  "bar" => "foo",
);
 
// 自PHP 5.4 起
$array = [
  "foo" => "bar",
  "bar" => "foo",
]
// key 可以是 integer 或 string 类型
// key 值为可选项, 如果未指定,则使用之前用过最大的integer键名加上1作为新键名
?>
 
// 要修改某个值,通过其键名给该单元赋一个新值.
// 要删除某个键值对,对其调用 unset() 函数.

PHP教程
<?php
class foo{
  function do_foo(){
    echo "Doing foo.";
  }
}
// 用 new 实例化一个类
$f = new foo;
$f->do_foo;

PHP教程
<?php
 
$a = 1;
// 值传递赋值 
$b = $a
// 引用赋值
$c = &$a
 
// global 症结字
global ； $GLOBALS