How to remove the first two characters of a string by php
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php Methods to remove the first two characters of a string: 1. Use the substr() function, syntax "substr($str,2)";2. Use the substr_replace() function, syntax "substr_replace($str,'',0,2)".
Operating environment of this tutorial: Windows 7 system, PHP7.1 version, DELL G3 computer
Php removes the first two characters of a string
Method 1: Use the substr() function
Output:
Description:
The substr() function returns a portion of a string. The syntax is as follows:
substr(string,start,length) Parameter Description string Required. Specifies a string of which part is to be returned. Start is required. Specifies where the string starts.
Positive number-starts at the specified position in the string
Negative-starts at the specified position from the end of the string
0 -starts at the first character in the string
Length is optional. Specifies the length of the string to return. The default is until the end of the string.
Positive-returns from where the start parameter is located
Negative number-returns from end of string
Note: If the start argument is negative and length is less than or equal to start, length is 0.
Method 2: Use the substr_replace() function
substr_replace() function is used to replace the specified position, the specified length of the character, when the replacement value is empty string Yes can be achieved to remove the function of the string.
Description:
The substr_replace() function replaces part of a string with another string. The syntax is as follows:
substr_replace(string,replacement,start,length) Parameters Description string Required. Specify the string to check. Replacement is required. Specifies the string to insert. Start is required. Specifies where the substitution starts in the string.
Positive number-starts at the specified position in the string
Negative-starts at the specified position from the end of the string
0 -starts at the first character in the string
Length is optional. Specify how many characters to replace. The default is the same length as the string.
Positive number-length of string being replaced
Negative-Number of characters replaced starting at the end of the string
0 -insert rather than replace
Note: If the start parameter is negative and length is less than or equal to start, length is 0.
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