[RESOLVED] stristr($var)

dcjones

Hi all,

I am trying to construct a small script whuich test the content of a string.

I want to test the content to find out if it contains, "one" or "two" of "three" or "four".

This is what I have:

?php
$flightchg = "one";

if(stristr($flightchg, "one" || "two" || "three" || "four")) {
print "true";
}else{
print "false";
}
?>

Am I using the correct code.

halojoy

stristr can only search for one word every time
so we need a loop
I have put those words in an array
and loop this array with foreach

when there is a match, $flag is set to true
and i stop further searching by break; the loop

I use [man]strripos/man .. only because I think it is faster
there are several other functions that can be used

<?php

$string = "four";
$search = array('one', 'two' ,'three', 'four');

$flag = false;
foreach($search AS $word){
    // echo $word; // only for test
	if(false !== strripos($string, $word)){
		$flag = true;
		break;
	}
}

if($flag){
	echo "true";
}else{
	echo "false";
}
?>

dcjones

Hi halojoy,

Majic, thank you very much.

Happy holidays.

halojoy

thanks the same!

dcjones

Hi halojoy,

If the content of $sting is dynamic, how can i find out what word was found, i.e "one, two, three or four.

<?php 

$string = "four"; 
$search = array('one', 'two' ,'three', 'four'); 

$flag = false; 
foreach($search AS $word){ 
    // echo $word; // only for test 
    if(false !== strripos($string, $word)){ 
        $flag = true; 
        break; 
    } 
} 

if($flag){ 
    echo "true"; 
}else{ 
    echo "false"; 
} 
?>

halojoy

Notice: I have changed to stripos() function.
There is no need to search in reverse direction in the string, like strripos()

This is a code that can be used to find if one text contains 'bad words'
from a list, an array, of such words.

Now the found word ( $fword ) will be displayed.
Or 'not found'.
$fword is set to empty string initially.

But only first found word is catched.
Say you have a string with both 'two' and 'three'.
Only will catch the word 'two'.

<?php

$string = "four";
$search = array('one', 'two' ,'three', 'four');

$fword = '';
foreach($search AS $word){
    if(false !== stripos($string, $word)){
        $fword = $word;
        break;
    }
}

if($fword){
    echo $fword;
}else{
    echo "not found";
}
?>

Weedpacket

The example you gave has the word being searched for match the entire word in the array. If that's the case then there's no need to do any string searching.

if(in_array(strtolower($word), array('one', 'two', 'three', 'four')))
{
    echo $word;
}
else
{
    // not found
}