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Philosopher (talk | contribs) m (nothing much) |
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) | ) | ||
{ | { | ||
# loop body | # loop body | ||
} | } | ||
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<syntaxhighlight lang="php"> | <syntaxhighlight lang="php"> | ||
for(var i=0; i < 3; i = i+1) { | for (var i=0; i < 3; i = i+1) { | ||
# loop body | |||
} | } | ||
while (condition) { | while (condition) { | ||
# loop body | |||
} | } | ||
</syntaxhighlight> | </syntaxhighlight> | ||
The differences are that there is no do{}while(); construct, and there is a foreach, which takes a local variable name as its first argument and a vector as its second: | The differences are that there is no <tt>do{}while()</tt>; construct, and there is a foreach/forindex, which takes a local variable name as its first argument and a vector as its second: | ||
<syntaxhighlight lang="php"> | <syntaxhighlight lang="php"> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
In other words, even though foreach or forindex look like function calls, they work differently. | In other words, even though foreach or forindex look like function calls, they work differently and they have braces after the parentheses. | ||
The hash/vector index expression is an lvalue that can be assigned as well as inspected: | The hash/vector index expression (one that uses brackets) is an lvalue that can be assigned as well as inspected: | ||
<syntaxhighlight lang="php"> | <syntaxhighlight lang="php"> | ||
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</syntaxhighlight> | </syntaxhighlight> | ||
To walk through all elements of a hash, | To walk through all elements of a hash, use a foreach loop on the keys of they hash. Then you call pull up the values of the hash using the key. Example: | ||
<syntaxhighlight lang="php"> | <syntaxhighlight lang="php"> | ||
myhash= {first: 1000, second: 250, third: 25.2 }; | myhash = {first: 1000, second: 250, third: 25.2 }; | ||
foreach (var i; keys (myhash)) { | foreach (var i; keys (myhash)) { | ||
#multiply each value by 2: | #multiply each value by 2: | ||
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print (i, ": ", myhash[i]); | print (i, ": ", myhash[i]); | ||
} | } | ||
# this will print in some order: | |||
#first: 2000 | |||
#second: 250 | |||
#thid: 25.2 | |||
</syntaxhighlight> | </syntaxhighlight> | ||
There is also a "forindex", which is like foreach except that it assigns the index of each element, instead of the value, to the loop variable. | There is also a "forindex", which is like foreach except that it assigns the ''index'' of each element, instead of the value, to the loop variable. | ||
<syntaxhighlight lang="php"> | <syntaxhighlight lang="php"> | ||
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<syntaxhighlight lang="php"> | <syntaxhighlight lang="php"> | ||
var c=0; | var c = 0; | ||
while( c<5 ) | while( c < 5 ) | ||
print( c+=1 ); | print( c += 1 ); | ||
print("end of loop\n"); | print("end of loop\n"); | ||
</syntaxhighlight> | </syntaxhighlight> |
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