PHP - Manual: stristr

2024-11-15

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stristr

(PHP 4, PHP 5, PHP 7, PHP 8)

stristr — strstr() 函数的忽略大小写版本

说明

stristr(string $haystack, mixed $needle, bool $before_needle = false): string

返回 haystack 字符串从 needle 第一次出现的位置开始到结尾的字符串。

参数

haystack: 在该字符串中查找。
needle: 如果 needle 不是一个字符串，那么它将被转换为整型并被视为字符顺序值。
before_needle: 若为 true，strstr() 将返回 needle 在 haystack 中的位置之前的部分(不包括 needle)。

参数 needle 和 haystack 将以不区分大小写的方式对待。

返回值

返回匹配的子字符串。如果 needle 未找到，返回 false。

更新日志

版本	说明
5.3.0	新增可选的 `before_needle` 参数。
4.3.0	stristr() 变为二进制安全的。

范例

示例 #1 stristr() 范例


<?php
  $email = 'USER@EXAMPLE.com';
  echo stristr($email, 'e'); // 输出 ER@EXAMPLE.com
  echo stristr($email, 'e', true); // 自 PHP 5.3.0 起，输出 US
?>

示例 #2 测试字符串的存在与否


<?php
  $string = 'Hello World!';
  if(stristr($string, 'earth') === FALSE) {
    echo '"earth" not found in string';
  }
// 输出: "earth" not found in string
?>

示例 #3 使用非字符串 needle


<?php
  $string = 'APPLE';
  echo stristr($string, 97); // 97 = 小写字母 a
// 输出: APPLE
?>

注释

注意: 此函数可安全用于二进制对象。

参见

strstr() - 查找字符串的首次出现
strrchr() - 查找指定字符在字符串中的最后一次出现
stripos() - 查找字符串首次出现的位置（不区分大小写）
strpbrk() - 在字符串中查找一组字符的任何一个字符
preg_match() - 执行匹配正则表达式

add a note

User Contributed Notes 8 notes

down

dpatton.at.confluence.org ¶

19 years ago


There was a change in PHP 4.2.3 that can cause a warning message
to be generated when using stristr(), even though no message was
generated in older versions of PHP.

The following will generate a warning message in 4.0.6 and 4.2.3:
  stristr("haystack", "");
     OR
  $needle = "";  stristr("haystack", $needle);

This will _not_ generate an "Empty Delimiter" warning message in
4.0.6, but _will_ in 4.2.3:
  unset($needle); stristr("haystack", $needle);

Here's a URL that documents what was changed:
http://groups.google.ca/groups?selm=cvshholzgra1031224321%40cvsserver

down

giz at gbdesign dot net ¶

14 years ago


Just been caught out by stristr trying to converting the needle from an Int to an ASCII value.


Got round this by casting the value to a string.


<?php

if( !stristr( $file, (string) $myCustomer->getCustomerID()  ) ) {

  // Permission denied

}

?>

down

Techdeck at Techdeck dot org ¶

19 years ago


An example for the stristr() function:

<?php
$a = "I like php";
if (stristr("$a", "LikE PhP")) {
print ("According to \$a, you like PHP.");
}
?>

It will look in $a for "like php" (NOT case sensetive. though, strstr() is case-sensetive).

For the ones of you who uses linux.. It is similiar to the "grep" command.
Actually.. "grep -i".

down

-3

notepad at codewalkers dot com ¶

17 years ago


<?php


function stristr_reverse($haystack, $needle) {

  $pos = stripos($haystack, $needle) + strlen($needle);

  return substr($haystack, 0, $pos);

}

$email = 'USER@EXAMPLE.com';

echo stristr_reverse($email, 'er');

// outputs USER


?>

down

-7

jukka ¶

8 years ago


I think there is a bug in php 5.3 in stristr with uppercase Ä containing other character

http://pastebin.com/5bP6uztY

if you search only with täry it works, but as soon as the word is tärylä  it does not. TÄRYL works fine

down

-8

art at awilton dot dotcom ¶

16 years ago


handy little bit of code I wrote to take arguments from the command line and parse them for use in my apps.

<?php

 $i = implode(" ",$argv); //implode all the settings sent via clie
$e = explode("-",$i); // no lets explode it using our defined seperator '-'

       //now lets parse the array and return the parameter name and its setting
       // since the input is being sent by the user via the command line
       //we will use stristr since we don't care about case sensitivity and
       //will convert them as needed later.

    while (list($index,$value) = each($e)){

       //lets grap the parameter name first using a double reverse string
       // to get the begining of the string in the array then reverse it again
       // to set it back. we will also "trim" off the "=" sign

     $param = rtrim(strrev(stristr(strrev($value),'=')),"=");

       //now lets get what the parameter is set to.
       // again "trimming" off the = sign

     $setting = ltrim(stristr($value,'='),"=");

       // now do something with our results.
       // let's just echo them out so we can see that everything is working

      echo "Array index is ".$index." and value is ".$value."\r\n";
      echo "Parameter is ".$param." and is set to ".$setting."\r\n\r\n";

}

?>

when run from the CLI this script returns the following.

[root@fedora4 ~]# php a.php -val1=one -val2=two -val3=three

Array index is 0 and value is a.php
Parameter is  and is set to

Array index is 1 and value is val1=one
Parameter is val1 and is set to one

Array index is 2 and value is val2=two
Parameter is val2 and is set to two

Array index is 3 and value is val3=three
Parameter is val3 and is set to three

[root@fedora4 ~]#

down

-14

greg at no_ggmac_reply dot com ¶

11 years ago


Beware the example given here:

if stristr($message,'viagra')
or stristr($message,'cialis')
)
{
die();
}

stristr does not search for words, it finds matching substrings.  So, for example, the check for 'cialis' will trigger on 'specialist'

down

-14

tomas dot nesrovnal at yourspirit dot cz ¶

13 years ago


Active item item in menu:

<?php
function aim($page) {
    if(stristr($_SERVER['REQUEST_URI'], $page)) {
        return ' class="active"';
    } 
}
?>

usage:

<style type="text/css">
.active {color: red;}
</style>

<?php
print '<a href="http://example.com/page/hello-world/"'. aim('hello-world') .'>HW</a>'; 
?>

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官方地址：https://www.php.net/manual/en/function.stristr.php

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stristr

说明

参数

返回值

更新日志

范例

注释

参见

User Contributed Notes 8 notes