How to query txt files in php

How to query txt files in php: 1. Determine whether the file exists through "if(file_exists($file)){...}"; 2. Use the fread function to read the txt file; 3. Use The file_get_contents function reads files.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

PHP query reads text files (TXT )

一：

<?
header("content-type:text/html;charset=utf-8");
$file = "demo.txt";
###判断该文件是否存在
if(file_exists($file)){
$file_arr = file($file); ###得到数组
$arr_new = array();
####对数组的处理
foreach($file_arr as $v){
$a = trim($v);
$a = str_replace("\r\n","",$a);
$a = str_replace("\r","",$a);
$a = str_replace("\n","",$a);
$arr_new[] = $a;
}
#####接下来就是对数组数据的取出#####
}else{
echo "file not exists!";
}
?>

二：

<?php
header("content-type:text/html;charset=utf-8");
$file = "demo1.txt";
###判断该文件是否存在
if(file_exists($file)){
$fp = fopen($file,"a+");  ###已追加的方式打开
$file_size = filesize($file); ###得到文件的大小，单位：字节
###使用fread函数
$res = fread($fp,$file_size);
####将读取的内容数据的处理
$res_new = str_replace("\r\n",",",$res);  ###注意，该替换要用双引号，即"".
###打印结果
##echo $res_new;
var_dump($res_new);
########对字符串数据的取出
}else{
echo "file not exists!";
}
fclose($fp);
?>

三：

<?php
header("content-type:text/html;charset=utf-8");
$file = "demo2.txt";
if(file_exists($file)){
####使用 file_get_contents函数
$res = file_get_contents($file);
$res_new = str_replace("\r\n",",",$res);  ##同上.
echo $res_new; 
####数据的其他处理
}else{
echo "file not exists!";
}
?>

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