PHP substr_compare () function
contoh
Membandingkan dua string:
<?php
echo substr_compare("Hello world","Hello world",0);
?>
echo substr_compare("Hello world","Hello world",0);
?>
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Definisi dan Penggunaan
() Fungsi membandingkan dua string dari yang ditentukan posisi awal substr_compare.
Tip: Fungsi ini biner aman dan selektif case-sensitive.
tatabahasa
substr_compare( string1,string2,startpos,length,case )
参数 | 描述 |
---|---|
string1 | 必需。规定要比较的第一个字符串。 |
string2 | 必需。规定要比较的第二个字符串。 |
startpos | 必需。规定在 string1 中的何处开始比较。如果为负数,则从字符串末端开始计数。 |
length | 可选。规定在 string1 中参与比较的字符数。 |
case | 可选。一个布尔值,规定是否执行区分大小写的比较:
|
rincian teknis
Pengembalian: | Fungsi ini mengembalikan:
|
---|---|
Versi PHP: | 5 + |
Update log: | Sejak PHP 5.1 dan seterusnya, memungkinkan penggunaan startpos negatif. |
contoh yang lebih
contoh 1
Membandingkan dua string, string1 untuk posisi awal ketika perbandingan adalah 06:00:
<?php
echo substr_compare("Hello world","world",6);
?>
echo substr_compare("Hello world","world",6);
?>
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contoh 2
Menggunakan semua parameter:
<?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);
?>
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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contoh 3
kembali nilai-nilai yang berbeda:
<?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
?>
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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PHP String Reference