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replace exact string with another string

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Apr 27.2009

Hi,

i want to replace one string with another string in php. That replace should consider exact strting.

Ex: this is test

after replacing is with was i want my string to be “this was test”;

plz help me out for this.

Regards
Gopi.

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PHP

3 Comments(s) ↴

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@MindzaiApr 27.2009 — [code=php]
$map = array(
'is' => 'was',
'foo' => 'bar',
'hello' => 'goodbye'
// etc
);
$string = 'hello! this is a string containing foo';
$string = str_replace(array_keys($map), $map, $string);
echo $string; // outputs "goodbye! this was a string containing bar"
[/code]
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@gpbodapatiauthorApr 27.2009 — Thanks for your response Mindzai.

but it is replacing all the occurances. i don't want to replace all the occurances.

what exactly i want is,

$str = "this is test";

if i replace is with was, string should be "this was test"

i am using preg_match condition with word boundary

preg_match("/bisb/","was",$str)

it is returning "this was test";

if i use below string it is should not replace any word.

$str = "this -is test";

preg_match("/bisb/","was",$str)

but still it is replacing is with was like "this -was test";

my requirement is it should not replace any word.

This what exactly i need , Plz hep me
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@NogDogApr 27.2009 — "-" is one of the things that will match for a word boundary ("b"). You could try some look-behind/-ahead assertions:
[code=php]
$new = preg_replace('#(?<=^|s)is(?=$|s)#', 'was', $str);
[/code]
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