What to do if php sessionstart reports an error

php session start error is because there is output content before executing the function. The solution is: 1. Create a PHP sample file; 2. Add "ob_start();" before "session_start()" That’s it.

The operating environment of this article: Windows7 system, PHP7.1 version, Dell G3 computer

What should I do if there is an error in php session start?

php session_start() error cause analysis and solution

Error message: Warning: session_start() [function.session- start]: Cannot send session cache limiter - headers already sent

Cause:If there is output content before session_start(), an error will occur,

Solution: Add ob_start() before session_start();

index.php

The code is as follows:

<?php 
error_reporting(-1); 
ob_start();//不加会出错，无法写入session 
register_shutdown_function(&#39;close&#39;); 
  
echo 1; 
 session_start(); 
$_SESSION[&#39;password&#39;]=&#39;mima2ddddddddddddddda2&#39;; 
function close() 
    { 
        if(session_id()!==&#39;&#39;) 
            @session_write_close(); 
    } 
?> 
<a href="index2.php" >index2</a>

index2.Php

The code is as follows:

<?php 
error_reporting(-1); 
ob_start();//不加会出错，无法读取session 
?
echo 1; 
 session_start(); 
echo $_SESSION[&#39;password&#39;]; 
var_dump($_SESSION); 
?> 
<a href="index.php" >index</a>

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