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How to remove the first two characters of a string in php

青灯夜游

Release： 2023-03-15 10:10:02

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php method to remove the first two characters of a string: 1. Use the substr() function, the syntax "substr($str,2)"; 2. Use the substr_replace() function, the syntax "substr_replace($str , '', 0,2)”.

How to remove the first two characters of a string in php

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php removes strings The first two characters

Method 1: Use the substr() function

<?php
$str = "Hello World!";
echo $str . "<br>";
echo substr($str,2);
?>

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Output:

How to remove the first two characters of a string in php

Description:

The substr() function returns a part of the string. The syntax is as follows:

substr(string,start,length)

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##ParameterDescriptionRequired. Specifies a part of the string to be returned. Required. Specifies where in the string to begin. Optional. Specifies the length of the string to be returned. The default is until the end of the string.


string
start	Positive number - starts at the specified position in the string Negative number - starts at the specified position from the end of the string 0 - at the first character in the string Start at
length	Positive number - Returns from the position of the start parameter Negative number - Returns from the end of the string

Note: If the start parameter is negative and length is less than or equal to start, length is 0.

Method 2: Use substr_replace() function

<?php
$str = "World!";
echo $str . "<br>";
echo substr_replace($str, &#39;&#39;, 0,2);
?>

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How to remove the first two characters of a string in php

substr_replace() function is used to replace characters at a specified position and length. , when the replacement value is an empty string, the function of removing the string can be realized.

Description:

The substr_replace() function replaces part of a string with another string. The syntax is as follows:

substr_replace(string,replacement,start,length)

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##ParameterstringreplacementstartlengthNote: If the start parameter is a negative number and length is less than or equal to start, length is 0.

Description
Required. Specifies the string to check.
Required. Specifies the string to be inserted.
Required. Specifies where in the string to begin replacement.	Positive number - starts at the specified position in the string Negative number - starts at the specified position from the end of the string 0 - at the first character in the string Start at
Optional. Specifies how many characters to replace. The default is the same as the string length.	Positive number - the length of the string to be replaced Negative number - the number of characters to be replaced from the end of the string 0 - insert instead of replace

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