$a='蛋蛋';
$b=$a;
$c=$a;
//这个时候内存占用相同,$b,$c都将指向$a的内存,无需额外占用
 
$b='蛋蛋1号';
//这个时候$b的数据已经改变了,无法再引用$a的内存,所以需要额外给$b开拓内存空间
 
unset($c);
//这个时候,删除$c,由于$c的数据是引用$a的数据,那么直接删除$a?

$a = 1111;
$b = $a;
$c = 22.222;
$d = $c;
 
xdebug_debug_zval('a');
xdebug_debug_zval('b');
xdebug_debug_zval('c');
xdebug_debug_zval('d');
echo "脚本结束\n";


//输出

a: (refcount=0, is_ref=0)=1111
b: (refcount=0, is_ref=0)=1111
c: (refcount=0, is_ref=0)=22.222
d: (refcount=0, is_ref=0)=22.222
脚本结束

$str = '蛋蛋';    // 静态字符串
$str = '蛋蛋' . time();//普通字符串


$a = 'aa';
$b = $a;
$c = $b;
 
$d = 'aa'.time();
$e = $d;
$f = $d;
 
xdebug_debug_zval('a');
xdebug_debug_zval('d');
echo "脚本结束\n";

//输出

a: (refcount=1, is_ref=0)='aa'
d: (refcount=3, is_ref=0)='aa1578156506'
脚本结束

<?php
/**
 * Created by PhpStorm.
 * User: Tioncico
 * Date: 2020/1/6 0006
 * Time: 14:22
 */
 
echo "php文件的全局开始\n";
 
class A{
    protected $a;
    function __construct($a)
    {
        $this->a = $a;
        echo "类A{$this->a}生命周期开始\n";
    }
    function test(){
        echo "类test方法域开始\n";
        echo "类test方法域结束\n";
    }
//通过类析构函数的特性,当类初始化或回收时,会调用相应的方法
    function __destruct()
    {
        echo "类A{$this->a}生命周期结束\n";
        // TODO: Implement __destruct() method.
    }
}
 
function a1(){
    echo "a1函数域开始\n";
    $a = new A(1);
    echo "a1函数域结束\n";
    //函数结束,将回收所有在函数a1的变量$a
}
a1();
 
$a = new A(2);
 
echo "php文件的全局结束\n";
//全局结束后,会回收全局的变量$a

echo "php文件的全局开始\n";
 
class A
{
    protected $a;
 
    function __construct($a)
    {
        $this->a = $a;
        echo "类{$this->a}生命周期开始\n";
    }
 
    function test()
    {
        echo "类test方法域开始\n";
        echo "类test方法域结束\n";
    }
 
//通过类析构函数的特性,当类初始化或回收时,会调用相应的方法
    function __destruct()
    {
        echo "类{$this->a}生命周期结束\n";
        // TODO: Implement __destruct() method.
    }
}
 
$arr = [];
$i = 0;
while (1) {
    $arr[] = new A('arr_' . $i);
    $obj = new A('obj_' . $i);
    $i++;
    echo "数组大小:". count($arr).'\n';
    sleep(1);
//$arr 会随着循环,慢慢的变大,直到内存溢出
 
}
 
echo "php文件的全局结束\n";
//全局结束后,会回收全局的变量$a

function a(){
    class A {
        public $ref;
        public $name;
 
        public function __construct($name) {
            $this->name = $name;
            echo($this->name.'->__construct();'.PHP_EOL);
        }
 
        public function __destruct() {
            echo($this->name.'->__destruct();'.PHP_EOL);
        }
    }
 
    $a1 = new A('$a1');
    $a2 = new A('$a2');
    $a3 = new A('$3');
 
    $a1->ref = $a2;
    $a2->ref = $a1;
 
    unset($a1);
    unset($a2);
 
    echo('exit(1);'.PHP_EOL);
}
a();
echo('exit(2);'.PHP_EOL);

class A
{
    public $ref;
    public $name;
 
    public function __construct($name)
    {
        $this->name = $name;
        echo($this->name . '->__construct();' . PHP_EOL);
    }
 
    public function __destruct()
    {
        echo($this->name . '->__destruct();' . PHP_EOL);
    }
}
 
$a = new A('$a');
$b = new A('$b');
unset($a);
//a将会先回收
echo('exit(1);' . PHP_EOL);
//b需要脚本结束才会回收

//输出
$a->__construct();
$b->__construct();
$a->__destruct();
exit(1);
$b->__destruct();

class A
{
    public $ref;
    public $name;
 
    public function __construct($name)
    {
        $this->name = $name;
        echo($this->name . '->__construct();' . PHP_EOL);
    }
 
    public function __destruct()
    {
        echo($this->name . '->__destruct();' . PHP_EOL);
    }
}
 
$a = new A('$a');
$b = new A('$b');
$c = new A('$c');
unset($a);
$c=null;
xdebug_debug_zval('a');
xdebug_debug_zval('b');
xdebug_debug_zval('c');
 
echo('exit(1);' . PHP_EOL);

<?php
include('head.php');
$sql = "select * from flow where published='y'";

$f_values = '';
$f_values .=<<<EOF
<?php
\$urls = [
EOF;
$flows = get_table_data($sql,$mysqli_space);
if(false == empty($flows)) 
{
    foreach($flows as $flow)
    {
        $f_values.=<<<EOF
        'https://www.12306.com/flow-{$flow['d_id']}.html',
EOF;
	$f_values.=PHP_EOL;
    }
}
//案例详情
$sql_bcase = "select * from beautycase where published='y'";

$cases = get_table_data($sql_bcase,$mysqli_space);
if(false == empty($cases)) 
{
    foreach($cases as $case)
    {
        $f_values.=<<<EOF
        'https://www.12306.com/beautycase-{$case['d_id']}.html',
EOF;
	$f_values.=PHP_EOL;
    }
}


$f_values.=<<<EOF
];
\$api = 'http://data.zz.baidu.com/urls?site=www.12306.com&token=abcdefg';
\$ch = curl_init();
\$options =  array(
    CURLOPT_URL => \$api,
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_POSTFIELDS => implode("\n", \$urls),
    CURLOPT_HTTPHEADER => array('Content-Type: text/plain'),
);
curl_setopt_array(\$ch, \$options);
\$result = curl_exec(\$ch);
echo \$result;
EOF;
file_put_contents('/www/wwwroot/TransDataToPub/putUrls.php',$f_values);