PHP method to find the occurrence position of a string through strpos, strpos string_PHP tutorial

php uses strpos to find the position where a string appears, strpos string

The example in this article describes how php uses strpos to find the position where a string appears. Share it with everyone for your reference. The specific analysis is as follows:

strpos is used to find the position where a string first appears in another string. strpos is case-sensitive. If it is not found, it returns false. Therefore, strpos has two types of return values, one is an integer and the other is It is of bool type, you need to pay attention during the development process

<&#63;php
echo strpos("Hello world!","wo");
&#63;>

Output result: 6

Since strpos has two types of return values, it is best to use === three equal signs to perform a strict type equality comparison when judging whether a substring is found

<&#63;php
$haystack = "needle23423432";
$pos = strpos($haystack, "needle");
if ($pos==false) {
 print("Not found based (==) test\n");
} else {
 print("Found based (==) test\n");
}
if ($pos===false) {
 print("Not found based (===) test\n");
} else {
 print("Found based (===) test\n");
}
&#63;>

The above code returns the following results

This script will print:
 
Not found based (==) test
Found based (===) test
 
The (===) test is correct.

I hope this article will be helpful to everyone’s PHP programming design.

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