Usage analysis of php string interception function, php string interception function_PHP tutorial

Usage analysis of php string interception function, php string interception function

This article analyzes the usage of PHP string interception function through examples. Share it with everyone for your reference. The specific analysis is as follows:

The function that comes with PHP to intercept strings can only handle English. Numbers cannot intercept mixed Chinese characters. The latter example is easier to use. The first one is mainly for beginners to learn. The specific code is as follows:

Copy code The code is as follows:

//Construct string
$str = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
echo "Original string:".$str."
";
//Intercept in various ways
$str1 = substr($str,5);
echo "Start from the 5th character to the end: ".$str1."
";
$str2 = substr($str,9,4);
echo "Take 4 characters starting from the 9th character: ".$str2."
";
$str3 = substr($str,-5);
echo "Take the last 5 characters: ".$str3."
";
$str4 = substr($str,-8,4);
echo "Take 4 characters backward starting from the 8th character from the bottom: ".$str4."
";
$str5 = substr($str,-8,-2);
echo "Start from the 8th character from the bottom to the 2nd character from the bottom: ".$str5."
";
?>

Supports mixed Chinese and English interception, the code is as follows:

Copy code The code is as follows:

/*
-------------------------------------------------- ----
Parameters:
$str_cut The string that needs to be truncated
$length The maximum length allowed for string display

Program function: intercept mixed full-width and half-width (Chinese and English) strings to avoid garbled characters
-------------------------------------------------- ----
*/
function substr_cut($str_cut,$length)
{
If (strlen($str_cut) > $length)
{ 
for($i=0; $i < $length; $i++)
If (ord($str_cut[$i]) > 128) $i++;
          $str_cut = substr($str_cut,0,$i)."..";
}  
Return $str_cut;
}
?>

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

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