How to intercept string length in php

PHP String Get

is used to get the specified string from the string.

Relevant functions are as follows:

substr(): Get a part of it from a string.

strstr(): Finds the first occurrence of a string in another string and returns all characters from that position to the end of the string.

subchr(): Same as strstr()

strrchr(): Find the last occurrence of a string in another string and return all characters from that position to the end of the string character.

Related recommendations: "PHP Tutorial"

substr()

substr() function is used to extract from a string Get part of it and return a string.

Syntax:

string substr ( string string, int start [, int length] )

Parameter description is as follows:

Example:

<?php
echo substr(&#39;abcdef&#39;, 1);      //输出 bcdef
echo substr(&#39;abcdef&#39;, 1, 2);   //输出 bc
echo substr(&#39;abcdef&#39;, -3, 2);  //输出 de
echo substr(&#39;abcdef&#39;, 1, -2);  //输出 bcd
?>

Tips

If start is negative and length is less than or equal to start, length is 0.

strstr()

Find the first occurrence of a string in another string and return all characters from that position to the end of the string, Returns FALSE if not found.

Syntax:

string strstr ( string string, string needle )

Parameter description is as follows:

Example:

<?php
$email = &#39;user@5idev.com&#39;;
$domain = strstr($email, &#39;@&#39;);
echo $domain;     // 输出 @5idev.com
?>

Tips

This function is case sensitive. For case-insensitive search, use stristr() .

strchr()

Same as strstr().

strrchr()

Find the last occurrence of a string in another string and return all characters from that position to the end of the string, if If not found, return FALSE.

Syntax:

string strrchr ( string string, string needle )

This function behaves the same as the strstr() function. For the meaning of the parameters, please refer to the strstr() function parameter description above.

Example:

<?php
$str="AAA|BBB|CCC";
echo strrchr($str, "|");
?>

Run the example, output:

|CCC

Combined with the substr() function, you can intercept all the content after the last character that appears:

<?php
$str="AAA|BBB|CCC";
echo substr(strrchr($str, "|"), 1);
?>

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