Tips for using mb_strpos in PHP

This article mainly introduces you to the usage skills of mb_strpos in PHP. It analyzes the usage in detail through the use of syntax and examples. Friends who need it can refer to it. Hope it helps everyone.

mb_strpos

(PHP 4 >= 4.0.6, PHP 5, PHP 7)
mb_strpos — Find position of first occurrence of string in a string
mb_strpos — Find the first occurrence of a string within another string

Description

int mb_strpos ( 
  string $haystack , 
  string $needle [, 
  int $offset = 0 [, 
  string $encoding = mb_internal_encoding() ]] 
  )
//Finds position of the first occurrence of a string in a string.
// 查找 string 在一个 string 中首次出现的位置。

//Performs a multi-byte safe strpos() operation based on number of characters. The first character's position is 0, the second character position is 1, and so on.
// 基于字符数执行一个多字节安全的 strpos() 操作。 第一个字符的位置是 0，第二个字符的位置是 1，以此类推。

Parameters

haystack

• The string being checked.
  

• The string being checked.
  

needle

• The string to find in haystack. In contrast with strpos(), numeric values ​​are not applied as the ordinal value of a character.
  

• Find this string in haystack. Unlike strpos(), numeric values ​​are not treated as character sequential values.
  

offset

• The search offset. If it is not specified, 0 is used. A negative offset counts from the end of the string.
  

• #The offset of the search position. If this parameter is not provided, 0 will be used. Negative offsets will be counted from the end of the string.
  

encoding

• The encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used.
  

• #encoding parameter is the character encoding. If omitted, the internal character encoding is used.
  

Return Values

• Returns the numeric position of the first occurrence of needle in the haystack string. If needle is not found, it returns FALSE.
  

• Returns the value of the first occurrence of needle in the haystack of string. If needle is not found, it returns FALSE.
  

Example

<?php
/** * Created by PhpStorm.
 * User: zhangrongxiang
 * Date: 2018/2/2
 * Time: 下午11:16
 */

$str = "Hello World! Hello PHP";
$pos = mb_strpos( $str, "Hello", 0, mb_internal_encoding() );
echo $pos .PHP_EOL;//0
$pos = mb_strpos( $str, "Hello", 2, mb_internal_encoding() );
echo $pos .PHP_EOL;//13

function mb_str_replace( $haystack, $search, $replace, $offset = 0, $encoding = 'auto' ) {
$len_sch = mb_strlen( $search, $encoding);
$len_rep = mb_strlen( $replace, $encoding);
​
while ( ( $offset = mb_strpos( $haystack, $search, $offset, $encoding ) ) !== false ) {
$haystack = mb_substr( $haystack, 0, $offset, $encoding)
          . $replace
                                                                                                                                                                                                      mb_substr      mb_substr                                                    offset,
        $le = mb_strlen( $haystack ) - mb_strlen( $search ) + mb_strlen( $replace ),
         $encoding );
//echo $le.PHP_EOL;
$offset = $offset + $len_rep;
If ( $offset > mb_strlen( $haystack, $encoding ) ) {
Break;
}
}
​
return $haystack;
}

$replace = mb_str_replace( "hello world !hello world !hello world !hello world !", "hello", "hi" );
echo $replace .PHP_EOL; //hi world !hi world !hi world !hi world !

//hi PHP !hi PHP !hi PHP !hi PHP !
echo mb_str_replace( $replace, "world", "PHP" ) . PHP_EOL;
echo mb_str_replace( $replace, " ", "-" ) . PHP_EOL;

//PHP is the best language in the world

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