php读取文件内容的三种方法
<?php
//**************第一种读取方式*****************************
代码如下:
header("content-type:text/html;charset=utf-8");
//文件路径
$file_path = "text.txt";
//判断是否有这个文件
if (file_exists($file_path)) {
if ($fp = fopen($file_path, "a+")) {
//读取文件
$conn = fread($fp, filesize($file_path));
//替换字符串
$conn = str_replace("rn", "<br/>", $conn);
echo $conn . "<br/>";
} else {
echo "文件打不开";
}
} else {
echo "没有这个文件";
}
fclose($fp);
//*******************第二种读取方式***************************
代码如下:
header("content-type:text/html;charset=utf-8");
//文件路径
$file_path = "text.txt";
$conn = file_get_contents($file_path);
$conn = str_replace("rn", "<br/>", file_get_contents($file_path));
echo $conn;
fclose($fp);
//******************第三种读取方式，循环读取*****************
代码如下:
header("content-type:text/html;charset=utf-8");
//文件路径
$file_path = "text.txt";
//判断文件是否存在
if (file_exists($file_path)) {
//判断文件是否能打开
if ($fp = fopen($file_path, "a+")) {
$buffer = 1024;
//边读边判断是否到了文件末尾
$str = "";
while (!feof($fp)) {
$str .= fread($fp, $buffer);
}
} else {
echo "文件不能打开";
}
} else {
echo "没有这个文件";
}
//替换字符
$str = str_replace("rn", "<br>", $str);
echo $str;
fclose($fp);
读取INI配置文件的函数:
$arr = parse_ini_file("config.ini");
//返回的是数组
echo $arr['host'] . "<br/>";
echo $arr['username'] . "<br/>";
echo $arr['password'] . "<br/>";
//_______________________读取大文件
$fp = fopen($file, "r");
$num = 10;
$chunk = 4096;
$fs = sprintf("%u", filesize($file));
$max = (intval($fs) == PHP_INT_MAX) ? PHP_INT_MAX : filesize($file);
for ($len = 0; $len < $max; $len += $chunk) {
$seekSize = ($max - $len > $chunk) ? $chunk : $max - $len;
fseek($fp, ($len + $seekSize) * -1, SEEK_END);
$readData = fread($fp, $seekSize) . $readData;
if (substr_count($readData, "n") >= $num + 1) {
preg_match("!(.*?n){" . ($num) . "}$!", $readData, $match);
$data = $match[0];
break;
}
}
fclose($fp);
echo $data;