PHP

PHP 笔记

文件操作

  • 读取文件内容
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# 方法1：直接readfile
echo readfile("test.txt");

# 方法2: fopen -> fread -> fclose
$myfile = fopen("test.txt","r") or die("Unable to open file.");
echo fread($myfile, filesize('test.txt'));
fclose($myfile);

# 方法3: fopen后循环fgets每次读取一行，也可以fgetc每次读取单字符
$myfile = fopen("test.txt","r") or die("Unable to open file.");
while ( !feof($myfile) ){
    echo fgets($myfile) . "<br>";
}
fclose($myfile);

  • 写入文件内容
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$myfile = fwrite("test.txt","w") or die("Unable to open file.");
$txt = "Write file test\n";
fwrite($myfile, $txt);
fwrite($myfile, "Write by php\n");
fclose($myfile);
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# 设置cookie
setcookie("user", "Mooonwhite", time()+3600);

# 获取cookie
if (isset($_COOKIE["user"])) {
    echo "Welcome ".$_COOKIE["user"]. "! <br/>";
}
else {
    echo "Welcome guest!<br/>";
}

# 删除cookie（设置超市时间为一小时之前）。
setcookie("user", "", time()-3600);

时间日期

  • 获取时间和日期
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# 获取格式化日期时间字符串
$dt = date("Y-m-d h:i:sa");
echo $dt;

# 获取19700101到现在的秒数（时间戳）。
$tm = time();
echo $tm;