PHP function substr_compare() that compares two strings from a specified starting position-PHP Tutorial-php.cn

Example

Compare two Strings:

<?php
echo substr_compare("Hello world","Hello world",0);
?>

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Definition and usage

substr_compare() function compares two strings from the specified starting position string.

Tip: This function is binary safe and optionally case sensitive.

Syntax

substr_compare(string1,string2,startpos,length,case)

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Parameters	Description
string1	Required. Specifies the first string to compare.
string2	Required. Specifies the second string to be compared.
startpos	Required. Specifies where in string1 to begin comparison. If negative, counting starts from the end of the string.
length	Optional. Specifies the number of characters in string1 to be compared.
case	Optional. A Boolean value that specifies whether to perform case-sensitive comparisons: FALSE - Default. Case Sensitive TRUE - Case Insensitive

Technical Details

As of PHP 5.1, negative startpos is allowed.

更多实例

实例 1

比较两个字符串，当 string1 中用于比较的开始位置为 6 时：

<?php
echo substr_compare("Hello world","world",6);
?>

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实例 2

使用所有的参数：

<?php
echo substr_compare("world","or",1,2); 
echo substr_compare("world","ld",-2,2); 
echo substr_compare("world","orl",1,2); 
echo substr_compare("world","OR",1,2,TRUE); 
echo substr_compare("world","or",1,3); 
echo substr_compare("world","rl",1,2);
?>

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实例 3

不同的返回值：

<?php
echo substr_compare("Hello world!","Hello world!",0); // the two strings are equal
echo substr_compare("Hello world!","Hello",0); // string1 is greater than string2
echo substr_compare("Hello world!","Hello world! Hello!",0); // str1 is less than str2
?>

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Return value:	This function returns: 0 - If the two strings are equal <0 - if string1 (startpos) is less than string2 >0 - if string1 (startpos) is greater than string2 If length is greater than or equal to the length of string1, this function returns FALSE.
PHP Version:	5+
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