PHP static 静态变量和属性方法使用说明

<?php
function Test()
{
static $count = 0;

$count++;
echo $count;
if ($count < 10) {
Test ();
}
$count--;
}
?>

<?php
function foo(){
static $int = 0; // correct
static $int = 1+2; // wrong  (as it is an expression)
static $int = sqrt(121); // wrong  (as it is an expression too)

$int++;
echo $int;
}
?>

<?php
function test_global_ref() {
global $obj;
$obj = &new stdclass;
}

function test_global_noref() {
global $obj;
$obj = new stdclass;
}

test_global_ref();
var_dump($obj);
test_global_noref();
var_dump($obj);
?>
 

NULL
object(stdClass)(0) {
}

<?php
function &get_instance_ref() {
static $obj;

echo "Static object: ";
var_dump($obj);
if (!isset($obj)) {
// 将一个引用赋值给静态变量
$obj = &new stdclass;
}
$obj->property++;
return $obj;
}

function &get_instance_noref() {
static $obj;

echo "Static object: ";
var_dump($obj);
if (!isset($obj)) {
// 将一个对象赋值给静态变量
$obj = new stdclass;
}
$obj->property++;
return $obj;
}

$obj1 = get_instance_ref();
$still_obj1 = get_instance_ref();
echo "n";
$obj2 = get_instance_noref();
$still_obj2 = get_instance_noref();
?>

Static object: NULL
Static object: NULL

Static object: NULL
Static object: object(stdClass)(1) {
  ["property"]=>
  int(1)
}

<?
$step = 7;
$zerotime = strtotime('1970-01-01'); // 不一定是0!

$span = ($time - $zerotime) % ($step * 86400);
$stime = $time - $span;
$etime = $stime + ($step * 86400) - 1;

$sdate = date("Y-m-d H:i:s", $stime);
$edate = date("Y-m-d H:i:s", $etime);
?>

eregi("<!--day 1-->(.*)<!--day 7-->",$page_content,$res);

$forecast = str_replace("<img src="","<img src="http://www.天气网com.cn",$res[0]);

$url = "http://www.天气网com.cn/weather/101050101.shtml";
$t1 = time();
   
$page_content = file_get_contents($url);
$t2 = time();

$start = 1;
$end = 3;

if ($end > 7){
    echo "超出预报能力范围，请重新设置！";
}else {
    echo "未来".($end-$start)."天哈尔滨的天气预报（"
              .date('Y-m-j')."发布）";

    eregi("--day $start--(.*)--day $end--", $page_content, $res);

    $forecast = str_replace("<img src="",
        "<img src="http://www.天气网com.cn", $res[0]);
    $t3 = time();

    echo $forecast;

    echo 'First step costs '.($t2 - $t1).' ms.';
    echo 'Last step costs '.($t3 - $t2).' ms.';
}

check_php_syntax.sh

#!/bin/bash
# check php syntax
if [ $# -lt 1 ];then
    echo 'Usage: ' $0  'directory';
    exit
fi
if [ ! -d $1 ];then
    echo $1  'not a directory,please check!';
    exit
fi
directory=$1
temp_file="/tmp/file$$"
#echo $temp_file
ls -R $directory | awk  '
    BEGIN{
        FS="n"   
        folder="'$directory'"
        logname="'$temp_file'"
    }
    {
        if($0~/.php$/){
            system("php -l " folder "/" $0  "   >>  " logname  " 2>&1") 
        }
        if($0~/:$/){
            folder=substr($1,1,length($1)-1)
        }
    }
'
if [ -e $temp_file ];then
    cat $temp_file | awk '
        BEGIN{
            error = 0
       }
        {
            if($0~/Parse/) {
                error++
                errorfile[$0] = $0
            }  
        }
        END{
            print "错误文件:" error "个"
            if(length(errorfile)>0) print "错误行数:"
                for (i in errorfile)
                    print i
        }
    '
else
    echo "php file not found."
    exit;
fi

print_r(getimagesize('http://www.111cn.net/logo.jpg'));
输出的结果为：
Array
(
    [0] => 550
    [1] => 190
    [2] => 3
    [3] => width="550" height="190"
    [bits] => 8
    [mime] => image/png
)