string handling

string in string

some functions to find strings inside other strings.

function InStr( ) [ line 5 ]

function InStrCount( ) [ line 23 ]

function InStrPos( ) [ line 43 ]

full source of string in string [ line 1 - 60 ] | download string in string

1	<?php
2	// InStr function
3	// checks for an occurance of a string
4	// within another string
5	function InStr($String,$Find,$CaseSensitive = false)
6	{
7	$i=0;
8	while (strlen($String)>=$i)
9	{
10	unset($substring);
11	if ($CaseSensitive)
12	{
13	$Find=strtolower($Find);
14	$String=strtolower($String);
15	}
16	$substring=substr($String,$i,strlen($Find));
17	if ($substring==$Find) return true;
18	$i++;
19	}
20	return false;
21	}
22	// A similar function, returns the number of occurances
23	function InStrCount($String,$Find,$CaseSensitive = false)
24	{
25	$i=0;
26	$x=0;
27	while (strlen($String)>=$i)
28	{
29	unset($substring);
30	if ($CaseSensitive)
31	{
32	$Find=strtolower($Find);
33	$String=strtolower($String);
34	}
35	$substring=substr($String,$i,strlen($Find));
36	if ($substring==$Find) $x++;
37	$i++;
38	}
39	return $x;
40	}
41	// Another similar function, this will return the position of
42	// the string. returns -1 if the string does not exist
43	function InStrPos($String,$Find,$CaseSensitive = false)
44	{
45	$i=0;
46	while (strlen($String)>=$i)
47	{
48	unset($substring);
49	if ($CaseSensitive)
50	{
51	$Find=strtolower($Find);
52	$String=strtolower($String);
53	}
54	$substring=substr($String,$i,strlen($Find));
55	if ($substring==$Find) return $i;
56	$i++;
57	}
58	return -1;
59	}
60	?>

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