php学习笔记之mb_strstr的基本使用

string mb_strstr ( 
 string $haystack , 
 string $needle [, 
 bool $before_needle = false [, 
 string $encoding =mb_internal_encoding() ]] 
 )

//mb_strstr() finds the first ourrence of needle in haystack and returns the portion of haystack. If needle is not found, it returns FALSE.
//mb_strstr() 查找了 needle 在 haystack 中的出现并返回 haystack 的一部分。 如果 needle 没有找到，它将返回 FALSE。

<?php
/
  Created by PhpStorm.
  User: zhangrongxiang
  Date: 2018/2/1
  Time: 下午10:27
 /

//  If set to true, it returns all of haystack from the beginning to the first ourrence of needle.
$strstr = mb_strstr( "hello china", "ll", true );
echo $strstr . PHP_EOL; //he

// If set to false, it returns all of haystack from the first ourrence of needle to the end,
$strstr = mb_strstr( "hello china", "ll", false );
echo $strstr . PHP_EOL;//llo china

//hello china
echo mb_strstr( "hello china", "ll", true ) . mb_strstr( "hello china", "ll", false ) . PHP_EOL;

$strstr = mb_strstr( "hello China,hello PHP", "ll", true );
echo $strstr . PHP_EOL; //he

$strstr = mb_strstr( "hello China,hello PHP", "ll", false );
echo $strstr . PHP_EOL; //llo China,hello PHP

$strstr = mb_strstr( "PHP是世界上最好的语言😄", "最好", true );
echo $strstr.PHP_EOL; //PHP是世界上
$strstr = mb_strstr( "PHP是世界上最好的语言😄", "最好", false );
echo $strstr.PHP_EOL; //最好的语言😄