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uphp:functions:is_numeric [2017/03/10 09:57] jeff |
uphp:functions:is_numeric [2021/09/13 05:57] (current) |
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======is_numeric====== | ======is_numeric====== | ||
+ | |||
< | < | ||
- | Return 1 if the value is numeric (integer, float or numeric string) | + | < |
====Description==== | ====Description==== | ||
- | <well size=" | + | |
- | <span style=" | + | <well size=" |
- | < | + | <span style=" |
- | <span style=" | + | <span style=" |
- | <span style=" | + | <span style=" |
- | <span style=" | + | <span style=" |
+ | <span style=" | ||
</ | </ | ||
- | Check if a value is numeric | + | Check to see if a value is numeric |
- | ====Parameters==== | + | ====Parameter==== |
- | < | + | |
- | ====Return | + | < |
- | 1 (true) if numeric, 0 (false) if not numeric (arrays always return 0) | + | |
+ | ====Return | ||
+ | |||
+ | < | ||
====Examples==== | ====Examples==== | ||
- | **Example #1** | ||
<code php> | <code php> | ||
<? | <? | ||
- | $f=1.0; | + | |
- | print(is_numeric($f)); | + | print(is_numeric($f)); |
- | $i=1; | + | $i=1; |
- | print(is_numeric($i)); | + | print(is_numeric($i)); |
- | $nns=" | + | $nns=" |
- | print(is_numeric($nns)); | + | print(is_numeric($nns)); |
- | $ns=" | + | $ns=" |
- | print(is_numeric($ns)); | + | print(is_numeric($ns)); |
?> | ?> | ||
</ | </ | ||
- | **Example #2** - Set up an array of different types of values. Then iterate through the array and output | + | ===Set up an array of different types of values, iterate through the array, output type, value and whether is_numeric() returns true or false=== |
<code php> | <code php> | ||
< | < | ||
- | $tests = array( | + | |
- | 1337, | + | 1337, |
- | 0x539, | + | 0x539, |
- | 02471, | + | 02471, |
- | 0b10100111001, | + | 0b10100111001, |
- | -25, | + | -25, |
- | 42.8, | + | 42.8, |
- | -365.0, | + | -365.0, |
- | " | + | " |
- | "no numbers", | + | "no numbers", |
- | "123 with numbers", | + | "123 with numbers", |
- | array(1, | + | array(1, |
- | ); | + | ); |
- | for ($i=0; | + | for ($i=0; |
- | if (is_int($tests[$i])) print(" | + | if (is_int($tests[$i])) print(" |
- | if (is_float($tests[$i])) print(" | + | if (is_float($tests[$i])) print(" |
- | if (is_string($tests[$i])) print(" | + | if (is_string($tests[$i])) print(" |
- | if (is_array($tests[$i])) print(" | + | if (is_array($tests[$i])) print(" |
- | if (!is_array($tests[$i])) print(" | + | if (!is_array($tests[$i])) print(" |
- | if (is_numeric($tests[$i])) { | + | if (is_numeric($tests[$i])) { |
- | print(" | + | print(" |
- | } else { | + | } else { |
- | print(" | + | print(" |
+ | } | ||
} | } | ||
- | } | ||
?></ | ?></ | ||
</ | </ | ||
Line 85: | Line 88: | ||
====Notes==== | ====Notes==== | ||
+ | |||
Unlike functions [[is_int()]], | Unlike functions [[is_int()]], | ||
====See Also==== | ====See Also==== | ||
- | [[is_int()]] - Return 1 if the variable is an integer | ||
- | [[is_float()]] - Return 1 if the variable is a float | + | [[is_int()]] - Check if a variable is an < |
- | [[is_string()]] - Return 1 if the variable is a string | + | [[is_float()]] - Check if a variable is a < |
- | [[is_array()]] - Return 1 if the variable is an array | + | [[is_string()]] - Check if a variable is a < |
- | [[uphp: | + | [[is_array()]] - Check if a variable is an < |
- | [[uphp: | + | [[isset()]] - Check if a variable exists |
- | [[array()]] - Create an array with values | + | [[uphp: |
- | [[uphp:control_structures: | + | [[uphp:variables|uPHP Variable Types and Limits]] |
- | [[uphp: | + | [[array()]] - Create an < |