How to remove the first dot character from a string in php

Removal steps: 1. Use the stripos() function to obtain the occurrence position of the first dot character "." in the string, the syntax is "stripos(string,".")"; 2. Use substr_replace( ) function simply replaces the dot character with a null character based on the obtained character position. The syntax is "substr_replace(string, "", the first occurrence position of the dot character, 1)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In php, you can use stripos() and The substr_replace() function removes the first "." character from the string.

Implementation steps:

Step 1. Use stripos() to get the occurrence position of the first dot character "." in the string

stripos() function can find the first occurrence of a specified string (character) in another string (case-insensitive). Dot characters don’t seem to need to be case sensitive! !

stripos(string,find,start)

#Return value: Returns the position of the first occurrence of a string in another string, or FALSE if the string is not found. Note: String positions start from 0, not 1.

You only need to set the second parameter of the function to the dot "." character, and the third parameter is omitted or set to 0.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "1.2.3.4.5.6.7";
echo "原字符串：";
var_dump($str);
$start=stripos($str,".");
echo "第一个点字符的出现位置：".$start;
?>

Step 2: Use the substr_replace() function to replace the character with an empty character based on the obtained character position

substr_replace () function replaces part of a string with another string.

substr_replace(string,replacement,start,length)

Just set the second parameter of the function to the null character, the third parameter to the character position, and the fourth parameter to 1.

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$str = "1.2.3.4.5.6.7";
echo "原字符串：";
var_dump($str);
$start=stripos($str,".");
$newStr=substr_replace($str,"",$start,1);
echo "去掉字符串的第一个点字符后：";
var_dump($newStr);
?>

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of How to remove the first dot character from a string in php. For more information, please follow other related articles on the PHP Chinese website!