PHP Find and replace a part of string

Question

I have an input string. Format is below:

This;is;my;long;string

Any fast solution (a lot of strings) to get this output string using PHP:

This;is;my;long

I need to remove this appendix: ;string

I don't know the length of appendix: ;any letters here.

Thanks!

What have you tried? Also, what are you really trying to do? — ghoti
– ghoti, Commented Sep 5, 2012 at 13:17

Matt · Accepted Answer · 2012-09-05 13:21:16Z

5

If you're consistently using ; as the delimiter, you can explode() the string, remove the last index, then rejoin the string using implode():

$str    = "This;is;my;long;string";
$strArr = explode(";", $str);

unset($strArr[count($strArr) - 1]);
$newStr = implode(";", $strArr);

UPDATE

In order to make this work for any searchable string, you can use array_keys():

$str             = "This;is;my;long;string";
$strArr          = explode(";", $str);
$searchStr       = "string";
$caseSensitive   = false;
$stringLocations = array_keys($strArr, $searchStr, $caseSensitive);

foreach ($stringLocations as $key) {
    unset($strArr[$key]);
}
$newStr = implode(";", $strArr);

Or, even quicker, you can use array_diff():

$str       = "This;is;my;long;string";
$strArr    = explode(";", $str);
$searchStr = array("string");
$newArray  = array_diff($searchStr, $strArr);
$newStr    = implode(";", $newArray);

edited Sep 5, 2012 at 13:21

answered Sep 5, 2012 at 13:15

Matt

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2 Comments

Matt Over a year ago

@Fluffeh I realized that was going to come up, so I updated the answer.

Nin Over a year ago

don't use implode/explode since it will be too slow.

Nin · Accepted Answer · 2012-09-05 13:17:35Z

4

$str = substr($string, 0, strrpos($string, ';'));

answered Sep 5, 2012 at 13:17

Nin

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Comments

Mark · Accepted Answer · 2012-09-05 13:14:26Z

2

str_replace

<?php 
$string='This;is;my;long;string';
str_replace(';string','',$string); ?>

answered Sep 5, 2012 at 13:14

Mark

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2 Comments

Matt Over a year ago

This is a bit short-sighted. It will only work for this case.

Mark Over a year ago

You can adjust the first parameter of str_replace with whatever you need to replace, using a string or array of strings. The question doesn't state the end case, is it always the last element, is it always delimited by ';' - he wanted ;string removing, this does it and can be easily adapted to most other situations.

aDaemon · Accepted Answer · 2012-09-05 13:17:01Z

2

$str = rtrim($str, ';string');

answered Sep 5, 2012 at 13:17

aDaemon

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Comments

Fluffeh · Accepted Answer · 2012-09-05 13:16:49Z

1

If you know that ;string will always be there (most of the time anyhow) you can use rtrim:

$trimmed = rtrim($text, ";string");

This will remove only the trailing ;string from the string. Unless it exists on the end of the string , it won't be deleted.

answered Sep 5, 2012 at 13:16

Fluffeh

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Comments

Duniyadnd · Accepted Answer · 2012-09-05 13:17:15Z

1

Not sure if the piece you want to remove is consistently at the beginning or not.

$array = explode(";" , $string);
foreach ( $array as $key => $arr ) {
    if ( $arr == "string" ) {
        unset($array[$key]);
        break;
    }
    echo implode(";" , $array);
}

answered Sep 5, 2012 at 13:17

Duniyadnd

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Comments

nick · Accepted Answer · 2012-09-05 13:14:58Z

0

If the string is always formatted that way you can't go wrong with substr - probably the fastest way

$str = 'This;is;my;long;string';
$str = substr( $str, 0, -7);

answered Sep 5, 2012 at 13:14

nick

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2 Comments

Matt Over a year ago

This is a bit short-sighted. It will only work for this case.

nick Over a year ago

i know, but maybe that's what he wanted. he mentioned speed, and substr is faster than str_replace

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